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Derivative Instruments (Income Statement Disclosure) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Gains (losses) related to cash flow hedges [Abstract]      
Gains (losses) recognized in OCI $ (125) $ (221) $ 129
Losses reclassified from AOCI to net income (88) (155) (105)
Gains (losses) related to derivatives not designated as hedging instruments [Abstract]      
Gains (losses) related to derivatives not designated as hedging instruments 948 356 7
Gains (losses) on commodity contracts, recorded as regulatory assets and or liabilities on the balance sheet due to regulatory treatment (326) (289) 81
Fair Value Hedging [Member]      
Gains (losses) related to derivatives not designated as hedging instruments [Abstract]      
Gain (loss) on fair value hedge reflected in interest expense (4) 20 (65)
Commodity contracts [Member] | Gain (loss) included in operating revenues [Member]      
Gains (losses) related to derivatives not designated as hedging instruments [Abstract]      
Gains (losses) related to derivatives not designated as hedging instruments 932 420 76
Commodity contracts [Member] | Gain (loss) included in fuel, purchased power and interchange [Member]      
Gains (losses) related to derivatives not designated as hedging instruments [Abstract]      
Gains (losses) related to derivatives not designated as hedging instruments 8 1 0
Foreign currency swap [Member]      
Gains (losses) related to cash flow hedges [Abstract]      
Gains (losses) recognized in OCI (12) (89) (21)
Losses reclassified from AOCI to net income (15) (78) (44)
Foreign currency swap [Member] | Gain (loss) included in other-net [Member]      
Gains (losses) related to derivatives not designated as hedging instruments [Abstract]      
Gains (losses) related to derivatives not designated as hedging instruments 0 (1) (72)
Foreign currency swap [Member] | Gain (loss) included in interest expense [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Net loss reclassified from AOCI to earnings 11 8 4
Interest Rate Contract [Member]      
Gains (losses) related to cash flow hedges [Abstract]      
Gains (losses) recognized in OCI (113) (132) 150
Losses reclassified from AOCI to net income (73) (77) (61)
Interest Rate Contract [Member] | Gain (loss) included in interest expense [Member]      
Gains (losses) related to derivatives not designated as hedging instruments [Abstract]      
Gains (losses) related to derivatives not designated as hedging instruments $ 8 $ (64) $ 3