00100 - Statement - Consolidated Statements Of Income
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00200 - Statement - Consolidated Statements Of Comprehensive Income
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00300 - Statement - Consolidated Statements Of Financial Position
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00400 - Statement - Consolidated Statements Of Cash Flows
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40503 - Disclosure - Stock-based Compensation (Schedule Of Stock-Based Compensation) (Details)
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40604 - Disclosure - Retirement Plans (Schedule Of Amounts Recognized In Statement Of Financial Position) (Details)
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40605 - Disclosure - Retirement Plans (Schedule Of Pre-Tax Amounts Recognized In Accumulated Other Comprehensive Income/(Loss)) (Details)
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40606 - Disclosure - Retirement Plans (Schedule Of Other Pre-Tax Changes Recognized In Other Comprehensive Income) (Details)
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40607 - Disclosure - Retirement Plans (Amounts Included In Accumulated Other Comprehensive Income Expected To Be Amortized Into Net Periodic Cost (Benefit)) (Details)
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40610 - Disclosure - Retirement Plans (Net Periodic Pension And OPEB Cost/(Benefit)) (Details)
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40701 - Disclosure - Other Income (Details)
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40802 - Disclosure - Income Taxes (Schedule Of Components Of Income Tax Expense) (Details)
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40803 - Disclosure - Income Taxes (Reconciliations Between Statutory And Effective Tax Rates) (Details)
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40804 - Disclosure - Income Taxes (Schedule Of Deferred Income Tax Liabilities And Assets) (Details)
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40806 - Disclosure - Income Taxes (Unrecognized Tax Benefits That Would/Not Reduce The Effective Tax Rate) (Details)
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40901 - Disclosure - Earnings Per Share (Details)
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41201 - Disclosure - Properties (Details)
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41301 - Disclosure - Accounts Payable And Other Current Liabilities (Details)
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41509 - Disclosure - Debt (Schedule Of Debt) (Details)
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41510 - Disclosure - Debt (Aggregate Debt Maturities) (Details)
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41702 - Disclosure - Leases (Future Minimum Lease Payments For Operating And Capital Leases) (Details)
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00090 - Document - Document and Entity Information
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00205 - Statement - Consolidated Statements Of Comprehensive Income (Parentheticals)
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00305 - Statement - Consolidated Statements Of Financial Position (Parentheticals)
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00500 - Statement - Consolidated Statements Of Changes In Common Shareholders' Equity
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00505 - Statement - Consolidated Statements of Changes in Common Shareholders' Equity (Parentheticals)
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10101 - Disclosure - Nature Of Operations
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10201 - Disclosure - Significant Accounting Policies
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10301 - Disclosure - Accounting Pronouncements
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10401 - Disclosure - Stock Split
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10501 - Disclosure - Stock Options And Other Stock Plans
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10601 - Disclosure - Retirement Plans
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10701 - Disclosure - Other Income
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10801 - Disclosure - Income Taxes
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10901 - Disclosure - Earnings Per Share
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11001 - Disclosure - Accumulated Other Comprehensive Income/(Loss)
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11101 - Disclosure - Accounts Receivable
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11201 - Disclosure - Properties
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11301 - Disclosure - Accounts Payable And Other Current Liabilities
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11401 - Disclosure - Financial Instruments
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11501 - Disclosure - Debt
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11601 - Disclosure - Variable Interest Entities
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11701 - Disclosure - Leases
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11801 - Disclosure - Commitments And Contingencies
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11901 - Disclosure - Share Repurchase Program
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12001 - Disclosure - Related Parties
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12101 - Disclosure - Selected Quarterly Data (Unaudited)
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12201 - Disclosure - Schedule Of Valuation And Qualifying Accounts
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20202 - Disclosure - Significant Accounting Policies (Policies)
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30103 - Disclosure - Nature Of Operations (Tables)
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30503 - Disclosure - Stock Options And Other Stock Plans (Tables)
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30603 - Disclosure - Retirement Plans (Tables)
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30703 - Disclosure - Other Income (Tables)
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30803 - Disclosure - Income Taxes (Tables)
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30903 - Disclosure - Earnings Per Share (Tables)
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31003 - Disclosure - Accumulated Other Comprehensive Income/(Loss) (Tables)
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31203 - Disclosure - Properties (Tables)
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31303 - Disclosure - Accounts Payable And Other Current Liabilities (Tables)
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31503 - Disclosure - Debt (Tables)
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31703 - Disclosure - Leases (Tables)
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31803 - Disclosure - Commitments And Contingencies (Tables)
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31903 - Disclosure - Share Repurchase Program (Tables)
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32103 - Disclosure - Selected Quarterly Data (Unaudited) (Tables)
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40101 - Disclosure - Nature Of Operations (Details)
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40401 - Disclosure - Stock Split (Details)
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40501 - Disclosure - Stock Options And Other Stock Plans (Narrative) (Details)
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40502 - Disclosure - Stock Options And Other Stock Plans (Stock Options, Retention Awards And Performance Retention Awards) (Narrative) (Details)
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40504 - Disclosure - Stock-based Compensation (Schedule Of Stock Options Weighted Average Assumptions) (Details)
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40505 - Disclosure - Stock-based Compensation (Summary Of Stock Option Activities) (Details)
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40506 - Disclosure - Stock-based Compensation (Schedule Of Stock Option Exercises) (Details)
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40507 - Disclosure - Stock-based Compensation (Schedule Of Retention Awards) (Details)
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40508 - Disclosure - Stock-based Compensation (Performance Retention Awards, Present Value Calculation Assumptions) (Details)
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40509 - Disclosure - Stock-based Compensation (Schedule Of Performance Retention Awards) (Details)
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40601 - Disclosure - Retirement Plans (Narrative) (Details)
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40602 - Disclosure - Retirement Plans (Other Retirement Programs) (Narrative) (Details)
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40603 - Disclosure - Retirement Plans (Schedule Of Changes In Projected Benefit Obligation And Plan Assets) (Details)
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40608 - Disclosure - Retirement Plans (Underfunded Accumulated Benefit Obligation) (Details)
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40609 - Disclosure - Retirement Plans (Weighted-Average Actuarial Assumptions Used To Determine Benefit Obligations) (Detail)
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40611 - Disclosure - Retirement Plans (Weighted-Average Actuarial Assumptions Used To Determine Benefit Expense) (Details)
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40612 - Disclosure - Retirement Plans (OPEB Effects From One-Percentage Point Change Assumed Healthcare Cost Trend Rates) (Details)
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40613 - Disclosure - Retirement Plans (Cash Contributions For Qualified Pension Plan Benefit Payments For Non-Qualified OPEB Plans) (Details)
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40614 - Disclosure - Retirement Plans (Schedule Of Expected Benefit Payments) (Details)
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40615 - Disclosure - Retirement Plans (Schedule Of Pension Plan Asset Allocation) (Details)
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40616 - Disclosure - Retirement Plans (Schedule Of Assets Measured At Fair Value On A Recurring Basis) (Details)
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40617 - Disclosure - Retirement Plans (Reconciliation Of Beginning Ending Balances Of Fair Value Measurements Using Significant Unobservable Inputs (Level 3)) (Details)
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40801 - Disclosure - Income Taxes (Narrative) (Details)
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40805 - Disclosure - Income Taxes (Reconciliation Of Changes In Unrecognized Tax Benefits Liabilities/(Assets)) (Details)
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41001 - Disclosure - Accumulated Other Comprehensive Income/(Loss) (Details)
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41101 - Disclosure - Accounts Receivable (Details)
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41401 - Disclosure - Financial Instruments (Details)
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41501 - Disclosure - Debt (Equipment Encumbrances) (Narrative) (Details)
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41502 - Disclosure - Debt (Credit Facilities) (Narrative) (Details)
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41503 - Disclosure - Debt (Dividend Restrictions) (Narrative) (Details)
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41504 - Disclosure - Debt (Shelf Registration And Significant New Borrowings) (Narrative) (Details)
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41505 - Disclosure - Debt (Equipment Trust) (Narrative) (Details)
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41506 - Disclosure - Debt (Debt Exchange) (Narrative) (Details)
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41507 - Disclosure - Debt (Debt Redemption) (Narrative) (Details)
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41508 - Disclosure - Debt (Receivables Securitization Facility) (Narrative) (Details)
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41511 - Disclosure - Debt (Unsecured Fixed Rate Debt Securities Issued Under Current Shelf Registration) (Details)
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41512 - Disclosure - Debt (Schedule Of Debt Exchange) (Details)
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41601 - Disclosure - Variable Interest Entities (Details)
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41701 - Disclosure - Leases (Narrative) (Details)
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41801 - Disclosure - Commitments And Contingencies (Narrative) (Details)
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41802 - Disclosure - Commitments And Contingencies (Commitments And Contingencies Activity) (Details)
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41901 - Disclosure - Share Repurchase Program (Details)
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42001 - Disclosure - Related Parties (Details)
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42101 - Disclosure - Selected Quarterly Data (Unaudited) (Details)
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42201 - Disclosure - Schedule Of Valuation And Qualifying Accounts (Details)
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