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Pension, OPEB and Savings Plans (Amounts Expected To Be Amortized From Accumulated OCL, Regulatory Assets And Deferred Assets Into Net Periodic Benefit Cost) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2015 USD ($)
Pension Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Actuarial (Gain) Loss | $ 158
Prior Service Cost | (18)
Other Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Actuarial (Gain) Loss | 40
Prior Service Cost | $ (14)

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