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Pension and Other Postretirement Benefits (Schedule of Net Periodic Pension Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 6 $ 8 $ 18 $ 27
Interest cost 24 15 69 44
Expected return on plan assets (30) (35) (90) (105)
Amortization of actuarial loss 7 9 20 25
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement (7) 0 (7) 0
Net periodic pension (benefit) cost 14 (3) 24 (9)
Pension Plan [Member] | Qualified Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 6 7 17 25
Interest cost 22 14 64 42
Expected return on plan assets (30) (35) (90) (105)
Amortization of actuarial loss 5 7 17 20
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 0 0 0 0
Net periodic pension (benefit) cost 3 (7) 8 (18)
Supplemental Employee Retirement Plan [Member] | Nonqualified Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 1 1 2
Interest cost 2 1 5 2
Expected return on plan assets 0 0 0 0
Amortization of actuarial loss 2 2 3 5
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement (7) 0 (7) 0
Net periodic pension (benefit) cost $ 11 $ 4 $ 16 $ 9