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Employee Benefit Plans (Summary Of Status Of Plan) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]      
Actual contributions during the year $ 6 $ 4 $ 7
Defined Benefit Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year 403 404  
Service cost 9 11 10
Interest cost 10 8 10
Actuarial (gain)/loss (115) (9)  
Curtailment  
Benefits paid (15) (12)  
Projected benefit obligation at end of year 291 403 404
Fair value of plan assets at beginning of year 377 354  
Actual return on plan assets (83) 31  
Actual contributions during the year 6 4  
Administrative expenses paid  
Benefits paid (15) (12)  
Fair value of plan assets at end of year 285 377 354
Funded status at end of year (6) (25)  
Post-Retirement Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year 31 35  
Service cost 1 1 1
Interest cost 1 1 1
Amendments  
Actuarial (gain)/loss (10) (6)  
Benefits paid  
Projected benefit obligation at end of year 21 31 35
Fair value of plan assets at beginning of year  
Actual contributions during the year  
Benefits paid  
Fair value of plan assets at end of year
Funded status at end of year $ (21) $ (31)