v3.26.3
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, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Debt Securities [Member]          
Marketable Securities, Available-for-sale [Line Items]          
Realized Gains $ 9 $ 25 $ 39 $ 56  
Realized Losses 19 17 51 58  
Proceeds from sale or maturity of securities 762 877 2,598 2,854  
Available for sale securities: Special Use Funds - Debt Securities [Member]          
Marketable Securities, Available-for-sale [Line Items]          
Unrealized gains 6   6   $ 62
Unrealized losses 245   245   68
Fair value 3,687   3,687   1,344
Florida Power & Light Company | Debt Securities [Member]          
Marketable Securities, Available-for-sale [Line Items]          
Realized Gains 5 22 30 49  
Realized Losses 14 14 37 45  
Proceeds from sale or maturity of securities 544 $ 494 1,724 $ 1,735  
Florida Power & Light Company | Available for sale securities: Special Use Funds - Debt Securities [Member]          
Marketable Securities, Available-for-sale [Line Items]          
Unrealized gains 5   5   34
Unrealized losses 132   132   37
Fair value $ 1,618   $ 1,618   $ 709