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Derivatives and Hedge Accounting Activities (Selected Information Related to Losses on Cash Flow Hedges Included in AOCI) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2017
USD ($)
Derivative Instruments, Gain (Loss) [Line Items]  
AOCI After-Tax $ (250)
Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax 3
Commodity | Gas  
Derivative Instruments, Gain (Loss) [Line Items]  
AOCI After-Tax 1
Commodities, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ 1
Maximum Term 40 months
Commodity | Electricity  
Derivative Instruments, Gain (Loss) [Line Items]  
AOCI After-Tax $ 15
Commodities, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ 15
Maximum Term 8 months
Commodity | Other Energy Contract  
Derivative Instruments, Gain (Loss) [Line Items]  
AOCI After-Tax $ 1
Commodities, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ 1
Maximum Term 9 months
Interest rate  
Derivative Instruments, Gain (Loss) [Line Items]  
AOCI After-Tax $ (269)
Interest rate, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (11)
Maximum Term 390 months
Foreign currency  
Derivative Instruments, Gain (Loss) [Line Items]  
AOCI After-Tax $ 2
Foreign currency, Amounts Expected to be Reclassified to Earnings During the Next 12 Months After-Tax $ (3)
Maximum Term 108 months