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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
Dec. 31, 2019
USD ($)
Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Actuarial (Gain) Loss $ 92
Prior Service Cost (10)
Other Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Actuarial (Gain) Loss 47
Prior Service Cost $ (128)