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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, 2021
Mar. 31, 2020
Dec. 31, 2020
Debt Securities [Member]      
Marketable Securities, Available-for-sale [Line Items]      
Realized Gains $ 18 $ 30  
Realized Losses 14 17  
Proceeds from sale or maturity of securities 548 738  
Available for sale securities: Special Use Funds - Debt Securities [Member]      
Marketable Securities, Available-for-sale [Line Items]      
Unrealized gains 72   $ 134
Unrealized losses 29   9
Fair value 747   201
FPL [Member] | Debt Securities [Member]      
Marketable Securities, Available-for-sale [Line Items]      
Realized Gains 12 25  
Realized Losses 13 15  
Proceeds from sale or maturity of securities 390 $ 607  
FPL [Member] | Available for sale securities: Special Use Funds - Debt Securities [Member]      
Marketable Securities, Available-for-sale [Line Items]      
Unrealized gains 56   104
Unrealized losses 21   9
Fair value $ 537   $ 150