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Non-Derivative Fair Value Measurements - Nonrecurring Fair Value Measurements (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2025	Dec. 31, 2024	Mar. 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			$ 5,270.0	$ 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

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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