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Pension and Other Postretirement Benefits (Schedule of Net Periodic Pension Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 6 $ 10 $ 12 $ 19
Interest cost 22 14 45 29
Expected return on plan assets (30) (35) (60) (70)
Amortization of actuarial loss 6 8 13 16
Net periodic pension (benefit) cost 4 (3) 10 (6)
Pension Plan [Member] | Qualified Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 6 9 11 18
Interest cost 21 14 42 28
Expected return on plan assets (30) (35) (60) (70)
Amortization of actuarial loss 6 7 12 13
Net periodic pension (benefit) cost 3 (5) 5 (11)
Supplemental Employee Retirement Plan [Member] | Nonqualified Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 1 1 1
Interest cost 1 0 3 1
Expected return on plan assets 0 0 0 0
Amortization of actuarial loss 0 1 1 3
Net periodic pension (benefit) cost $ 1 $ 2 $ 5 $ 5