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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, 2026
Mar. 31, 2025
Dec. 31, 2025
Debt Securities [Member]      
Marketable Securities, Available-for-sale [Line Items]      
Realized Gains $ 21 $ 14  
Realized Losses 15 18  
Proceeds from sale or maturity of securities 1,055 768  
Available for sale securities: Special Use Funds - Debt Securities [Member]      
Marketable Securities, Available-for-sale [Line Items]      
Unrealized gains 28   $ 62
Unrealized losses 99   68
Fair value 2,072   1,344
Florida Power & Light Company | Debt Securities [Member]      
Marketable Securities, Available-for-sale [Line Items]      
Realized Gains 18 13  
Realized Losses 11 13  
Proceeds from sale or maturity of securities 647 $ 535  
Florida Power & Light Company | Available for sale securities: Special Use Funds - Debt Securities [Member]      
Marketable Securities, Available-for-sale [Line Items]      
Unrealized gains 14   34
Unrealized losses 61   37
Fair value $ 1,073   $ 709