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Derivative Instruments (Income Statement Disclosure) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Gains (losses) related to derivatives not designated as hedging instruments [Abstract]      
Gains (losses) related to derivatives not designated as hedging instruments $ 153 $ 551 $ 948
Cash Flow Hedging [Member]      
Gains (losses) related to cash flow hedges [Abstract]      
Losses recognized in OCI     (125)
Losses reclassified from AOCI to net income     (88)
Foreign currency contracts [Member] | Cash Flow Hedging [Member]      
Gains (losses) related to cash flow hedges [Abstract]      
Losses recognized in OCI     (12)
Losses reclassified from AOCI to net income     (15)
Foreign currency contracts [Member] | Gain (loss) included in interest expense [Member]      
Gains (losses) related to cash flow hedges [Abstract]      
Losses reclassified from AOCI to net income     (11)
Interest Rate Contract [Member] | Cash Flow Hedging [Member]      
Gains (losses) related to cash flow hedges [Abstract]      
Losses recognized in OCI     (113)
Losses reclassified from AOCI to net income     (73)
Not Designated as Hedging Instrument [Member] | Commodity contracts [Member] | Gains (Losses) 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 454 459 932
Not Designated as Hedging Instrument [Member] | Commodity contracts [Member] | Gains (Losses) 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 0 (1) 8
Not Designated as Hedging Instrument [Member] | Foreign currency contracts [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 55 14 0
Not Designated as Hedging Instrument [Member] | Foreign currency contracts [Member] | Gains (Losses) 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 (4) (1) 0
Not Designated as Hedging Instrument [Member] | 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 (223) 181 8
Reclassification out of Accumulated Other Comprehensive Income [Member] | Not Designated as Hedging Instrument [Member] | Foreign currency contracts [Member] | Gain (loss) included in interest expense [Member]      
Gains (losses) related to derivatives not designated as hedging instruments [Abstract]      
Interest Expense (81) (11) 0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Gain (loss) included in interest expense [Member]      
Gains (losses) related to derivatives not designated as hedging instruments [Abstract]      
Interest Expense (48) (90) 0
FPL[Member]      
Gains (losses) related to derivatives not designated as hedging instruments [Abstract]      
Gains (losses) on commodity contracts, recorded as regulatory assets and or liabilities on the balance sheet due to regulatory treatment $ (169) $ 203 $ (326)