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Fair Value Measurements (Reconciliation of Change in Fair Value of Derivatives, Significant Unobservable Inputs) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivative Financial Instruments, Net [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Fair value of net derivatives based on significant unobservable inputs at December 31 of prior year | $ 647 | $ 566 | $ 578
Realized and unrealized gains (losses): |  |  |
Included in earnings | 923 | 35 | 376
Included in other comprehensive income (loss) | 5 | 7 | (18)
Included in regulatory assets and liabilities | 1 | (18) | 0
Purchases | 141 | 152 | 126
Settlements | (356) | 28 | (317)
Issuances | (87) | (115) | (197)
Impact of adoption of new revenue standard | 0 | (30) | 0
Transfers in | (5) | 0 | 17
Transfers out | (62) | 22 | 1
Fair value of net derivatives based on significant unobservable inputs at December 31 | 1,207 | 647 | 566
Gains (losses) included in earnings attributable to the change in unrealized gains (losses) relating to derivatives held at the reporting date | 611 | 100 | 277
Realized and unrealized gains (losses) reflected in operating revenues | 956 | 48 | 379
Unrealized gains (losses) reflected in operating revenues, for derivatives still held at the reporting date | 638 | 112 | 281
FPL[Member] | Derivative Financial Instruments, Net [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Fair value of net derivatives based on significant unobservable inputs at December 31 of prior year | (36) | 0 | 1
Realized and unrealized gains (losses): |  |  |
Included in earnings | 0 | (1) | 0
Included in other comprehensive income (loss) | 0 | 0 | 0
Included in regulatory assets and liabilities | 1 | (18) | 0
Purchases | 0 | (16) | 0
Settlements | 25 | (2) | (1)
Issuances | 0 | 0 | 0
Impact of adoption of new revenue standard | 0 | 0 |
Transfers in | 0 | 0 | 0
Transfers out | 2 | 1 | 0
Fair value of net derivatives based on significant unobservable inputs at December 31 | (8) | (36) | 0
Gains (losses) included in earnings attributable to the change in unrealized gains (losses) relating to derivatives held at the reporting date | 0 | $ (1) | $ 0
Significant Unobservable Inputs (Level 3) [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Liabilities, Fair Value Disclosure | 390 |  |
Interest Rate Swap [Member] | Significant Unobservable Inputs (Level 3) [Member] | NEER [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Liabilities, Fair Value Disclosure | $ 133 |  |

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- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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