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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, 2025
Mar. 31, 2024
Dec. 31, 2024
Debt Securities [Member]      
Marketable Securities, Available-for-sale [Line Items]      
Realized Gains $ 14 $ 11  
Realized Losses 18 11  
Proceeds from sale or maturity of securities 768 564  
Available for sale securities: Special Use Funds - Debt Securities [Member]      
Marketable Securities, Available-for-sale [Line Items]      
Unrealized gains 36   $ 25
Unrealized losses 96   119
Fair value 1,579   2,224
Florida Power & Light Company | Debt Securities [Member]      
Marketable Securities, Available-for-sale [Line Items]      
Realized Gains 13 10  
Realized Losses 13 8  
Proceeds from sale or maturity of securities 535 $ 432  
Florida Power & Light Company | Available for sale securities: Special Use Funds - Debt Securities [Member]      
Marketable Securities, Available-for-sale [Line Items]      
Unrealized gains 21   16
Unrealized losses 47   61
Fair value $ 885   $ 1,160