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Non-Derivative Fair Value Measurements (Gains and Losses) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Schedule of Available-for-sale Securities[Line Items] |  |  |
Decommissioning Fund Investments, Fair Value | $ 8,697 | $ 7,495 |
Special Use Funds Storm Fund Assets | 1 | 1 |
Debt securities, amortized cost | $ 3,329 | 2,858 |
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity | 9 years |  |
Special Use Funds Other Investments Weighted Average Maturity | 6 years |  |
Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Realized gains | $ 40 | 30 | $ 78
Realized losses | 169 | 141 | 73
Proceeds from sale and maturity of Available-for-sale Securities | 2,380 | 2,207 | 1,831
Available for sale securities: Special Use Funds - Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Unrealized gains | 41 | 4 |
Unrealized losses | 134 | 285 |
Fair Value | 1,862 | 2,315 |
FPL [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Decommissioning Fund Investments, Fair Value | 6,049 | 5,220 |
Special Use Funds Storm Fund Assets | 1 | 1 |
Debt securities, amortized cost | $ 1,693 | 1,873 |
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity | 9 years |  |
FPL [Member] | Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Realized gains | $ 35 | 24 | 59
Realized losses | 147 | 111 | 57
Proceeds from sale and maturity of Available-for-sale Securities | 1,921 | 1,371 | 1,330
FPL [Member] | Available for sale securities: Special Use Funds - Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Unrealized gains | 31 | 3 |
Unrealized losses | 71 | 193 |
Fair Value | 872 | 1,466 |
Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
marketable securities, unrealized gain (loss) recognized during the period on securities still held | 881 | (1,028) | 981
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 | $ 598 | $ (677) | $ 652

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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://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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