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Pension, OPEB and Savings Plans (Pre-Tax Changes Recognized In Accumulated Other Comprehensive Income (Loss), Regulatory Assets And Deferred Assets) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net Actuarial (Gain) Loss in Current Period | $ (608) | $ 296
Amortization of Net Actuarial Gain (Loss) | (103) | (92)
Prior Service Cost (Credit) in Current Period | 0 | 0
Amortization of Prior Service Credit | 0 | 10
Total | (711) | 214
Other Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net Actuarial (Gain) Loss in Current Period | (127) | 2
Amortization of Net Actuarial Gain (Loss) | (44) | (47)
Prior Service Cost (Credit) in Current Period | 0 | (5)
Amortization of Prior Service Credit | 129 | 128
Total | $ (42) | $ 78

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