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Derivative Instruments and Hedging Activities (Reconciliation of Changes in the Fair Value) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Realized and unrealized gains (losses):      
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net Cash Provided by (Used in) Operating Activities Net Cash Provided by (Used in) Operating Activities Net Cash Provided by (Used in) Operating Activities
Derivative Financial Instruments, Net [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair value of net derivatives based on significant unobservable inputs at December 31 of prior year $ 951 $ (854) $ 170
Realized and unrealized gains (losses):      
Included in earnings 339 2,792 (2,343)
Included in regulatory assets and liabilities 49 23 158
Purchases 161 412 542
Settlements (998) (1,521) 992
Issuances (128) (139) (362)
Transfers in 20 (129) (4)
Transfers out (7) 367 (7)
Fair value of net derivatives based on significant unobservable inputs at December 31 387 951 (854)
Gains (losses) included in earnings attributable to the change in unrealized gains (losses) relating to derivatives held at the reporting date (25) 1,482 (1,162)
FPL [Member] | Derivative Financial Instruments, Net [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair value of net derivatives based on significant unobservable inputs at December 31 of prior year 24 9 8
Realized and unrealized gains (losses):      
Included in earnings 0 0 0
Included in regulatory assets and liabilities 49 23 158
Purchases 0 0 0
Settlements (27) (11) (157)
Issuances 0 0 0
Transfers in (12) 1 0
Transfers out 0 2 0
Fair value of net derivatives based on significant unobservable inputs at December 31 34 24 9
Gains (losses) included in earnings attributable to the change in unrealized gains (losses) relating to derivatives held at the reporting date 0 $ 0 $ 0
Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Liabilities, Fair Value Disclosure $ 952