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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, 2020 | Dec. 31, 2019
Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net Actuarial (Gain) Loss in Current Period | $ 296 | $ 241
Amortization of Net Actuarial Gain (Loss) | (92) | (96)
Prior Service Cost (Credit) in Current Period | 0 | 0
Amortization of Prior Service Credit | 10 | 18
Total | 214 | 163
Other Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net Actuarial (Gain) Loss in Current Period | 2 | 39
Amortization of Net Actuarial Gain (Loss) | (47) | (50)
Prior Service Cost (Credit) in Current Period | (5) | 0
Amortization of Prior Service Credit | 128 | 128
Total | $ 78 | $ 117

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