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Non-Derivative Fair Value Measurements (Gains and Losses on Available-for-sale Debt Securities) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Debt Securities [Member] |  |  |
Marketable Securities, Available-for-sale [Line Items] |  |  |
Realized Gains | $ 11 | $ 8 |
Realized Losses | 11 | 38 |
Proceeds from sale or maturity of securities | 564 | 428 |
Available for sale securities: Special Use Funds - Debt Securities [Member] |  |  |
Marketable Securities, Available-for-sale [Line Items] |  |  |
Unrealized gains | 25 |  | $ 41
Unrealized losses | 144 |  | 134
Fair value | 2,134 |  | 1,862
Florida Power & Light Company | Debt Securities [Member] |  |  |
Marketable Securities, Available-for-sale [Line Items] |  |  |
Realized Gains | 10 | 7 |
Realized Losses | 8 | 30 |
Proceeds from sale or maturity of securities | 432 | $ 299 |
Florida Power & Light Company | Available for sale securities: Special Use Funds - Debt Securities [Member] |  |  |
Marketable Securities, Available-for-sale [Line Items] |  |  |
Unrealized gains | 18 |  | 31
Unrealized losses | 77 |  | 71
Fair value | $ 968 |  | $ 872

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