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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

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