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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 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Debt Securities [Member]          
Marketable Securities, Available-for-sale [Line Items]          
Realized Gains $ 8 $ 17 $ 26 $ 61  
Realized Losses 41 14 100 58  
Proceeds from sale or maturity of securities 681 245 1,901 1,303  
Available for sale securities: Special Use Funds - Debt Securities [Member]          
Marketable Securities, Available-for-sale [Line Items]          
Unrealized gains 2   2   $ 76
Unrealized losses 342   342   19
Fair value 2,378   2,378   1,100
Florida Power & Light Company | Debt Securities [Member]          
Marketable Securities, Available-for-sale [Line Items]          
Realized Gains 6 14 20 46  
Realized Losses 36 11 79 46  
Proceeds from sale or maturity of securities 324 $ 191 1,001 $ 988  
Florida Power & Light Company | Available for sale securities: Special Use Funds - Debt Securities [Member]          
Marketable Securities, Available-for-sale [Line Items]          
Unrealized gains 2   2   63
Unrealized losses 239   239   15
Fair value $ 1,598   $ 1,598   $ 857