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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, 2023
Mar. 31, 2022
Dec. 31, 2022
Debt Securities [Member]      
Marketable Securities, Available-for-sale [Line Items]      
Realized Gains $ 8 $ 8  
Realized Losses 38 27  
Proceeds from sale or maturity of securities 428 721  
Available for sale securities: Special Use Funds - Debt Securities [Member]      
Marketable Securities, Available-for-sale [Line Items]      
Unrealized gains 18   $ 4
Unrealized losses 223   285
Fair value 2,181   2,315
Florida Power & Light Company | Debt Securities [Member]      
Marketable Securities, Available-for-sale [Line Items]      
Realized Gains 7 7  
Realized Losses 30 19  
Proceeds from sale or maturity of securities 299 $ 418  
Florida Power & Light Company | Available for sale securities: Special Use Funds - Debt Securities [Member]      
Marketable Securities, Available-for-sale [Line Items]      
Unrealized gains 13   3
Unrealized losses 147   193
Fair value $ 1,212   $ 1,466