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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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service Cost | $ 12 | $ 9 | $ 22 | $ 19
Interest Cost | 12 | 17 | 25 | 34
Expected Return on Plan Assets | (36) | (38) | (71) | (75)
Amortization of Actuarial Loss | 14 | 12 | 27 | 23
Net Periodic Pension Cost (Credit) | 2 | 0 | 3 | 1
Pension Plan [Member] | Qualified Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service Cost | 10 | 8 | 19 | 17
Interest Cost | 12 | 16 | 24 | 32
Expected Return on Plan Assets | (36) | (38) | (71) | (75)
Amortization of Actuarial Loss | 12 | 11 | 23 | 20
Net Periodic Pension Cost (Credit) | (2) | (3) | (5) | (6)
Supplemental Employee Retirement Plan [Member] | Nonqualified Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service Cost | 2 | 1 | 3 | 2
Interest Cost | 0 | 1 | 1 | 2
Expected Return on Plan Assets | 0 | 0 | 0 | 0
Amortization of Actuarial Loss | 2 | 1 | 4 | 3
Net Periodic Pension Cost (Credit) | $ 4 | $ 3 | $ 8 | $ 7

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