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Employee Benefit Plans (Schedule Of Fair Value Of Plan Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 1,269 $ 1,742
Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 68 135
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 68 135
Mutual Fund [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 245 426
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 245 426
Common collective trust funds - International equity [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 76 193
Common collective trust funds - U.S. equity [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 23 34
Debt instruments - Corporate bonds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 318 304
Debt instruments - Corporate bonds [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 318 304
Debt instruments - U.S. Treasury instruments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 173 226
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 173 226
Debt instruments - U.S. government agency, state and local government bonds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 5 3
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 5 3
Other Debt Instruments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 9 8
Other Debt Instruments [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 9 8
Common Collective Trust - Fixed Income    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 247 285
Common Collective Trust - Other    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 105 128
Fair Value, Recurring [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 818 1,102
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 486 787
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 332 $ 315