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Fair Value Measurements (Gains and Losses on Available-for-sale Debt Securities) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Debt Securities [Member]          
Marketable Securities, Available-for-sale [Line Items]          
Realized Gains $ 30 $ 21 $ 86 $ 47  
Realized Losses 17 14 50 34  
Proceeds from sale or maturity of securities 555 612 2,046 2,087  
Available for sale securities: Special Use Funds - Debt Securities [Member]          
Marketable Securities, Available-for-sale [Line Items]          
Unrealized gains 120   120   $ 75
Unrealized losses 23   23   7
Fair value 314   314   314
FPL [Member] | Debt Securities [Member]          
Marketable Securities, Available-for-sale [Line Items]          
Realized Gains 21 15 66 30  
Realized Losses 10 11 38 20  
Proceeds from sale or maturity of securities 475 $ 489 1,747 $ 1,717  
FPL [Member] | Available for sale securities: Special Use Funds - Debt Securities [Member]          
Marketable Securities, Available-for-sale [Line Items]          
Unrealized gains 92   92   58
Unrealized losses 21   21   7
Fair value $ 239   $ 239   $ 240