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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, 2016 | Dec. 31, 2015
Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net Actuarial (Gain) Loss in Current Period | $ 211 | $ 136
Amortization of Net Actuarial Gain (Loss) | (158) | (150)
Prior Service Cost (Credit) in current period | 1 | 0
Amortization of Prior Service Credit | 19 | 19
Total | 73 | 5
Other Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net Actuarial (Gain) Loss in Current Period | 125 | (14)
Amortization of Net Actuarial Gain (Loss) | (40) | (43)
Prior Service Cost (Credit) in current period | (3) | 0
Amortization of Prior Service Credit | 14 | 14
Total | $ 96 | $ (43)

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