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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Debt Securities [Member]          
Marketable Securities, Available-for-sale [Line Items]          
Realized Gains $ 10 $ 26 $ 18 $ 44  
Realized Losses 33 30 59 44  
Proceeds from sale or maturity of securities 498 511 1,220 1,059  
Available for sale securities: Special Use Funds - Debt Securities [Member]          
Marketable Securities, Available-for-sale [Line Items]          
Unrealized gains 4   4   $ 76
Unrealized losses 231   231   19
Fair value 2,252   2,252   1,100
Florida Power & Light Company | Debt Securities [Member]          
Marketable Securities, Available-for-sale [Line Items]          
Realized Gains 7 20 14 32  
Realized Losses 24 23 43 36  
Proceeds from sale or maturity of securities 259 $ 407 677 $ 797  
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 161   161   15
Fair value $ 1,547   $ 1,547   $ 857