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Employee Benefit Plans (Components Of Net Periodic Pension Costs) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 22 $ 36 $ 41
Interest cost 92 59 51
Expected return on plan assets (120) (139) (142)
Amortization of actuarial loss 28 32 54
Settlement charge 17 6 11
Net periodic pension (benefit) cost 39 (6) 15
Qualified Plan [Member] | Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 21 34 38
Interest cost 86 56 49
Expected return on plan assets (120) (139) (142)
Amortization of actuarial loss 24 25 46
Settlement charge 0 4 0
Net periodic pension (benefit) cost 11 (20) (9)
Nonqualified Plan [Member] | Supplemental Employee Retirement Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 1 2 3
Interest cost 6 3 2
Expected return on plan assets 0 0 0
Amortization of actuarial loss 4 7 8
Settlement charge 17 2 11
Net periodic pension (benefit) cost $ 28 $ 14 $ 24