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Non-Derivative Fair Value Measurements (Gains and Losses) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Available-for-sale Securities[Line Items] |  |  |
Decommissioning Fund Investments, Fair Value | $ 7,703 | $ 6,880 |
Special Use Funds Storm Fund Assets | 76 | 74 |
Debt Securities, Available-for-sale, Amortized Cost | $ 2,009 | 2,030 |
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity | 8 years |  |
Special Use Funds Storm Fund Weighted Average Maturity | 1 year |  |
Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Realized gains | $ 110 | 68 | $ 51
Realized losses | 70 | 48 | 75
Proceeds from sale and maturity of Available-for-sale Securities | 2,541 | 3,005 | 2,551
Available for sale securities: Special Use Funds - Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Unrealized gains | 134 | 75 |
Unrealized losses | 9 | 7 |
Fair Value | 201 | 314 |
FPL[Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Decommissioning Fund Investments, Fair Value | 5,271 | 4,697 |
Special Use Funds Storm Fund Assets | 76 | 74 |
Debt Securities, Available-for-sale, Amortized Cost | $ 1,521 | 1,523 |
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity | 9 years |  |
Special Use Funds Storm Fund Weighted Average Maturity | 1 year |  |
FPL[Member] | Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Realized gains | $ 83 | 44 | 31
Realized losses | 56 | 29 | 49
Proceeds from sale and maturity of Available-for-sale Securities | 2,162 | 2,539 | $ 2,100
FPL[Member] | Available for sale securities: Special Use Funds - Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Unrealized gains | 104 | 58 |
Unrealized losses | 9 | 7 |
Fair Value | $ 150 | 240 |
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 | $ 627 | 780 |
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 | $ 444 | $ 510 |
Weighted Average [Member] | Nuclear Decommissioning Funds [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Debt Securities, Available-for-sale, Term |  |  |
Weighted Average [Member] | FPL[Member] | Nuclear Decommissioning Funds [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Debt Securities, Available-for-sale, Term |  |  |
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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