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Non-Derivative Fair Value Measurements - Nonrecurring Fair Value Measurements (Details) - USD ($) $ / shares in Units, $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity method investment, impairment | $ 700.0 |  |
Impairment charge, net of tax | 500.0 |  |
Trading price (per share) |  | $ 9.50 |
Investment in equity method investees | $ 5,451.0 |  | $ 6,118.0
NextEra Energy Resources |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity method investments, fair value |  | $ 1,000.0 |
Investment in equity method investees |  | $ 1,700.0 |

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