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Derivative Instruments - Narrative (Details) - USD ($)
Mar. 31, 2026
Dec. 31, 2025
Derivative [Line Items]    
Margin cash collateral received from counterparties that was not offset against derivative assets $ 58,000,000 $ 94,000,000
Margin cash collateral provided to counterparties that was not offset against derivative assets or liabilities 155,000,000 70,000,000
Florida Power & Light Company    
Derivative [Line Items]    
Margin cash collateral received from counterparties that was not offset against derivative assets 9,000,000 5,000,000
Margin cash collateral provided to counterparties that was not offset against derivative assets or liabilities $ 0 $ 0