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Derivative Instruments (Income Statement Disclosure) (Details) - USD ($) $ in Millions | 12 Months Ended
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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)

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- Definition Pursuant to regulatory accounting treatment, net gain (loss) recorded by FPL that is included in regulatory assets and or liabilities for the period from the net change in fair value of derivative instrument not designated as hedging instrument. + References No definition available. + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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