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Non-Derivative Fair Value Measurements (Gains and Losses) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Schedule of Available-for-sale Securities[Line Items] |  |  |
Decommissioning Fund Investments, Fair Value | $ 9,799 | $ 8,697 |
Debt securities, amortized cost | $ 3,720 | 3,329 |
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity | 9 years |  |
Special Use Funds Other Investments Weighted Average Maturity | 8 years |  |
Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Realized gains | $ 53 | 40 | $ 30
Realized losses | 86 | 169 | 141
Proceeds from sale and maturity of Available-for-sale Securities | 2,874 | 2,380 | 2,207
Available for sale securities: Special Use Funds - Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Unrealized gains | 25 | 41 |
Unrealized losses | 119 | 134 |
Fair Value | 2,224 | 1,862 |
FPL [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Decommissioning Fund Investments, Fair Value | 6,874 | 6,049 |
Debt securities, amortized cost | $ 1,780 | 1,693 |
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 | $ 46 | 35 | 24
Realized losses | 71 | 147 | 111
Proceeds from sale and maturity of Available-for-sale Securities | 2,274 | 1,921 | 1,371
FPL [Member] | Available for sale securities: Special Use Funds - Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
Unrealized gains | 16 | 31 |
Unrealized losses | 61 | 71 |
Fair Value | 1,160 | 872 |
Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities[Line Items] |  |  |
marketable securities, unrealized gain (loss) recognized during the period on securities still held | 917 | 881 | (1,028)
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 | $ 668 | $ 598 | $ (677)

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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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