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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Debt Securities [Member]          
Marketable Securities, Available-for-sale [Line Items]          
Realized Gains $ 17 $ 30 $ 61 $ 86  
Realized Losses 14 17 58 50  
Proceeds from sale or maturity of securities 245 555 1,303 2,046  
Available for sale securities: Special Use Funds - Debt Securities [Member]          
Marketable Securities, Available-for-sale [Line Items]          
Unrealized gains 81   81   $ 134
Unrealized losses 12   12   9
Fair value 799   799   201
FPL [Member] | Debt Securities [Member]          
Marketable Securities, Available-for-sale [Line Items]          
Realized Gains 14 21 46 66  
Realized Losses 11 10 46 38  
Proceeds from sale or maturity of securities 191 $ 475 988 $ 1,747  
FPL [Member] | Available for sale securities: Special Use Funds - Debt Securities [Member]          
Marketable Securities, Available-for-sale [Line Items]          
Unrealized gains 65   65   104
Unrealized losses 8   8   9
Fair value $ 556   $ 556   $ 150