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Derivative Instruments (Income Statement Disclosure) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Gains (losses) related to derivatives not designated as hedging instruments [Abstract] |  |  |
Gains (losses) related to derivatives not designated as hedging instruments | $ (99) | $ 20 | $ 80
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal | 353 | 406 | 80
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 | 352 | 762 | 377
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 | 0 | (2)
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 | 8 | (7) | 19
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 | (421) | (699) | (280)
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 | (3) | (4) | (4)
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 | (35) | (32) | (30)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Gains (Loss) On Disposal Of Businesses/Assets - Net [Member] |  |  |
Gains (losses) related to derivatives not designated as hedging instruments [Abstract] |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal | 23 |  |
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 | $ 6 | $ 9 | $ (31)

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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=121590274&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=121590274&loc=SL5624171-113959 + Details
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