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Fair Value Measurements (Reconciliation of Changes in the Fair Value) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Realized and unrealized gains (losses): [Abstract] |  |  |  |
Fair value based on significant unobservable inputs, ending balance | $ 1,305 | $ 1,231 | $ 1,305 | $ 1,231
FPL [Member] |  |  |  |
Realized and unrealized gains (losses): [Abstract] |  |  |  |
Fair value based on significant unobservable inputs, ending balance | (6) | (13) | (6) | (13)
Derivative Financial Instruments, Net [Member] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Fair value based on significant unobservable inputs, beginning balance | 1,519 | 844 | 1,207 | 647
Realized and unrealized gains (losses): [Abstract] |  |  |  |
Included in earnings | (38) | 513 | 349 | 692
Included in other comprehensive income | 1 | (2) | 1 | 1
Included in regulatory assets and liabilities | 0 | 1 | (2) | (1)
Purchases | 39 | 43 | 120 | 67
Sales |  |  | 114 | 0
Settlements | (176) | (81) | (382) | (119)
Issuances | (40) | (37) | (72) | (51)
Transfers out | 0 | (50) | (30) | (5)
Fair value based on significant unobservable inputs, ending balance | 1,305 | 1,231 | 1,305 | 1,231
Gains (losses) included in earnings attributable to the change in unrealized gains (losses) relating to derivatives held at the reporting date | (31) | 487 | 176 | 568
Realized and unrealized gains (losses) reflected in operating revenues | (36) | 509 | 369 | 703
Unrealized gains (losses) reflected in operating revenues related to derivatives still held at the reporting date | (30) | 482 | 188 | 578
Derivative Financial Instruments, Net [Member] | FPL [Member] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Fair value based on significant unobservable inputs, beginning balance | (9) | (16) | (8) | (36)
Realized and unrealized gains (losses): [Abstract] |  |  |  |
Included in earnings | 0 | 0 | 0 | 0
Included in other comprehensive income | 0 | 0 | 0 | 0
Included in regulatory assets and liabilities | 0 | 1 | (2) | (1)
Purchases | 0 | 0 | 0 | 0
Sales |  |  | 0 | 0
Settlements | 3 | 2 | 4 | 22
Issuances | 0 | 0 | 0 | 0
Transfers out | 0 | 0 | 0 | 2
Fair value based on significant unobservable inputs, ending balance | (6) | (13) | (6) | (13)
Gains (losses) included in earnings attributable to the change in unrealized gains (losses) relating to derivatives held at the reporting date | $ 0 | $ 0 | $ 0 | $ 0

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- Definition This element represents total gains or losses for the period (realized and unrealized), arising from net assets (liabilities) measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in regulatory assets and liabilities. + References No definition available. + Details
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- Definition This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets) in Earnings. Such unrealized (holding) gains or losses relate to those assets (liabilities) still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References No definition available. + Details
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- Definition This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets) in Operating Revenues. Such unrealized (holding) gains or losses relate to those assets (liabilities) still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References No definition available. + Details
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- Definition This item represents the amount of the total realized and unrealized gains or losses for the period which are included in the statement of income (or changes in net assets) in operating revenues; the fair value of which assets was or is measured on a recurring basis using significant unobservable inputs (Level 3). + References No definition available. + Details
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- Definition Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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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 sales of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + 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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