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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, 2015 | Dec. 31, 2014
Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net Actuarial (Gain) Loss in Current Period | $ 136 | $ 803
Amortization of Net Actuarial Gain (Loss) | (150) | (56)
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax | 19 | 18
Total | 5 | 765
Other Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net Actuarial (Gain) Loss in Current Period | (14) | 208
Amortization of Net Actuarial Gain (Loss) | (43) | (23)
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax | 14 | 14
Total | $ (43) | $ 199

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