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Derivative Instruments (Income Statement Disclosure) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract] |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | $ (71) | $ 53 | $ 83 | $ 238
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Gains (losses) included in operating revenues [Member] |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract] |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | (187) | 114 | (7) | 538
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Gain Loss Included In Interest Expense Member |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract] |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | (17) | (4) | 3 | 53
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Gains (Losses) Included In Other - Net [Member] |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract] |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | 0 | (2) | 0 | (5)
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Gain Loss Included In Interest Expense Member |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract] |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | 142 | (41) | 115 | (232)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Gain Loss Included In Interest Expense Member |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract] |  |  |  |
Interest Expense | (1) | (1) | (3) | (80)
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 |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract] |  |  |  |
Interest Expense | (8) | (13) | (25) | (36)
FPL [Member] |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract] |  |  |  |
Gains (losses) on commodity contracts, recorded as regulatory assets and or liabilities on the balance sheet due to regulatory treatment | $ (1) | $ (12) | $ 4 | $ (164)

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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 Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (210.5-03(11)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 + Details
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