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Fair Value Measurements (Available for Sale Securities) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Available-for-sale Securities[Line Items] |  |  |
Decommissioning Fund Investments, Fair Value | $ 6,880 | $ 5,818 |
Debt Securities, Available-for-sale, Amortized Cost | $ 2,030 | 1,994 |
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity | 8 years |  |
Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Realized gains | $ 68 | 51 |
Realized losses | 48 | 75 |
Proceeds from sale and maturity of Available-for-sale Securities | 3,005 | 2,551 |
debt and equity securities [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Realized gains |  |  | $ 178
Realized losses |  |  | 83
Proceeds from sale and maturity of Available-for-sale Securities |  |  | 2,817
Available for sale securities: Special Use Funds - Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Unrealized gains | 75 | 14 |
Unrealized losses | 7 | 52 |
Fair Value | 314 | 1,273 |
FPL[Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Decommissioning Fund Investments, Fair Value | 4,697 | 3,987 |
Special Use Funds Storm Fund Assets | 74 | 68 |
Debt Securities, Available-for-sale, Amortized Cost | 1,523 | 1,542 |
FPL[Member] | Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Realized gains | 44 | 31 |
Realized losses | 29 | 49 |
Proceeds from sale and maturity of Available-for-sale Securities | 2,539 | 2,100 |
FPL[Member] | debt and equity securities [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Realized gains |  |  | 75
Realized losses |  |  | 50
Proceeds from sale and maturity of Available-for-sale Securities |  |  | $ 1,902
FPL[Member] | Available for sale securities: Special Use Funds - Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Unrealized gains | 58 | 11 |
Unrealized losses | 7 | 41 |
Fair Value | $ 240 | 961 |
Debt Securities [Member] | Storm Fund [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Debt Securities, Available-for-sale, Term | 1 year |  |
Debt Securities [Member] | FPL[Member] | Storm Fund [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Debt Securities, Available-for-sale, Term | 1 year |  |
Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
marketable securities, unrealized gain (loss) recognized during the period on securities still held | $ 780 | (259) |
Equity Securities [Member] | FPL[Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
marketable securities, unrealized gain (loss) recognized during the period on securities still held | $ 510 | $ (131) |
Weighted Average [Member] | Nuclear Decommissioning Funds [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Debt Securities, Available-for-sale, Term | 8 years |  |
Weighted Average [Member] | FPL[Member] | Nuclear Decommissioning Funds [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Debt Securities, Available-for-sale, Term | 8 years |  |
Weighted Average [Member] | FPL[Member] | Storm Fund [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Debt Securities, Available-for-sale, Term | 1 year |  |

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- Definition The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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