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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, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service Cost | $ 10 | $ 12 | $ 19 | $ 22
Interest Cost | 14 | 12 | 29 | 25
Expected Return on Plan Assets | (35) | (36) | (70) | (71)
Amortization of Actuarial Loss | 8 | 14 | 16 | 27
Net Periodic Pension Cost (Credit) | (3) | 2 | $ (6) | 3
Document Fiscal Year Focus |  |  | 2022 |
Pension Plan [Member] | Qualified Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service Cost | 9 | 10 | $ 18 | 19
Interest Cost | 14 | 12 | 28 | 24
Expected Return on Plan Assets | (35) | (36) | (70) | (71)
Amortization of Actuarial Loss | 7 | 12 | 13 | 23
Net Periodic Pension Cost (Credit) | (5) | (2) | (11) | (5)
Supplemental Employee Retirement Plan [Member] | Nonqualified Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service Cost | 1 | 2 | 1 | 3
Interest Cost | 0 | 0 | 1 | 1
Expected Return on Plan Assets | 0 | 0 | 0 | 0
Amortization of Actuarial Loss | 1 | 2 | 3 | 4
Net Periodic Pension Cost (Credit) | $ 2 | $ 4 | $ 5 | $ 8

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