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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, 2022
Mar. 31, 2021
Dec. 31, 2021
Debt Securities [Member]      
Marketable Securities, Available-for-sale [Line Items]      
Realized Gains $ 8 $ 18  
Realized Losses 27 14  
Proceeds from sale or maturity of securities 721 548  
Available for sale securities: Special Use Funds - Debt Securities [Member]      
Marketable Securities, Available-for-sale [Line Items]      
Unrealized gains 16   $ 76
Unrealized losses 115   19
Fair value 2,039   1,100
Florida Power & Light Company | Debt Securities [Member]      
Marketable Securities, Available-for-sale [Line Items]      
Realized Gains 7 12  
Realized Losses 19 13  
Proceeds from sale or maturity of securities 418 $ 390  
Florida Power & Light Company | Available for sale securities: Special Use Funds - Debt Securities [Member]      
Marketable Securities, Available-for-sale [Line Items]      
Unrealized gains 13   63
Unrealized losses 78   15
Fair value $ 1,394   $ 857