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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Debt Securities [Member]          
Marketable Securities, Available-for-sale [Line Items]          
Realized Gains $ 8 $ 10 $ 19 $ 18  
Realized Losses 16 39 28 76  
Proceeds from sale or maturity of securities 666 592 1,215 1,020  
Available for sale securities: Special Use Funds - Debt Securities [Member]          
Marketable Securities, Available-for-sale [Line Items]          
Unrealized gains 24   24   $ 41
Unrealized losses 147   147   134
Fair value 2,283   2,283   1,862
Florida Power & Light Company | Debt Securities [Member]          
Marketable Securities, Available-for-sale [Line Items]          
Realized Gains 6 9 17 15  
Realized Losses 10 32 18 62  
Proceeds from sale or maturity of securities 521 $ 442 939 $ 740  
Florida Power & Light Company | Available for sale securities: Special Use Funds - Debt Securities [Member]          
Marketable Securities, Available-for-sale [Line Items]          
Unrealized gains 18   18   31
Unrealized losses 83   83   71
Fair value $ 1,066   $ 1,066   $ 872