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Employee Benefit Plans (Schedule Of Fair Value Of Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 1,742 | $ 2,337
Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 135 | 251
Equity Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 135 | 251
Mutual Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 426 | 666
Mutual Fund [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 426 | 666
Common collective trust funds - International equity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 193 | 316
Common collective trust funds - U.S. equity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 34 | 23
Debt instruments - Corporate bonds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 304 | 328
Debt instruments - Corporate bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 304 | 328
Debt instruments - U.S. Treasury instruments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 226 | 345
Debt instruments - U.S. Treasury instruments [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 226 | 345
Debt instruments - U.S. government agency, state and local government bonds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 3 | 4
Debt instruments - U.S. government agency, state and local government bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 3 | 4
Other Debt Instruments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 8 | 9
Other Debt Instruments [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 8 | 9
Common Collective Trust - Fixed Income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 285 | 245
Common Collective Trust - Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 128 | 150
Fair Value, Recurring [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,102 | 1,603
Fair Value, Recurring [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 787 | 1,262
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 315 | $ 341

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