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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, 2024
Mar. 31, 2023
Dec. 31, 2023
Debt Securities [Member]      
Marketable Securities, Available-for-sale [Line Items]      
Realized Gains $ 11 $ 8  
Realized Losses 11 38  
Proceeds from sale or maturity of securities 564 428  
Available for sale securities: Special Use Funds - Debt Securities [Member]      
Marketable Securities, Available-for-sale [Line Items]      
Unrealized gains 25   $ 41
Unrealized losses 144   134
Fair value 2,134   1,862
Florida Power & Light Company | Debt Securities [Member]      
Marketable Securities, Available-for-sale [Line Items]      
Realized Gains 10 7  
Realized Losses 8 30  
Proceeds from sale or maturity of securities 432 $ 299  
Florida Power & Light Company | Available for sale securities: Special Use Funds - Debt Securities [Member]      
Marketable Securities, Available-for-sale [Line Items]      
Unrealized gains 18   31
Unrealized losses 77   71
Fair value $ 968   $ 872