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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 | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Debt Securities [Member] |  |  |  |  |
Marketable Securities, Available-for-sale [Line Items] |  |  |  |  |
Realized Gains | $ 25 | $ 21 | $ 56 | $ 40 |
Realized Losses | 17 | 17 | 58 | 45 |
Proceeds from sale or maturity of securities | 877 | 597 | 2,854 | 1,812 |
Available for sale securities: Special Use Funds - Debt Securities [Member] |  |  |  |  |
Marketable Securities, Available-for-sale [Line Items] |  |  |  |  |
Unrealized gains | 64 |  | 64 |  | $ 25
Unrealized losses | 64 |  | 64 |  | 119
Fair value | 1,139 |  | 1,139 |  | 2,224
Florida Power & Light Company | Debt Securities [Member] |  |  |  |  |
Marketable Securities, Available-for-sale [Line Items] |  |  |  |  |
Realized Gains | 22 | 19 | 49 | 35 |
Realized Losses | 14 | 14 | 45 | 33 |
Proceeds from sale or maturity of securities | 494 | $ 451 | 1,735 | $ 1,390 |
Florida Power & Light Company | Available for sale securities: Special Use Funds - Debt Securities [Member] |  |  |  |  |
Marketable Securities, Available-for-sale [Line Items] |  |  |  |  |
Unrealized gains | 36 |  | 36 |  | 16
Unrealized losses | 30 |  | 30 |  | 61
Fair value | $ 661 |  | $ 661 |  | $ 1,160

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