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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, 2023
Dec. 31, 2022
Dec. 31, 2021
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 $ (854) $ 170 $ 1,374
Realized and unrealized gains (losses):      
Included in earnings 2,792 (2,343) (1,488)
Included in regulatory assets and liabilities 23 158 8
Purchases 412 542 243
Settlements (1,521) 992 259
Issuances (139) (362) (196)
Transfers in (129) (4) 2
Transfers out 367 (7) (32)
Fair value of net derivatives based on significant unobservable inputs at December 31 951 (854) 170
Gains (losses) included in earnings attributable to the change in unrealized gains (losses) relating to derivatives held at the reporting date 1,482 (1,162) (924)
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 9 8 (1)
Realized and unrealized gains (losses):      
Included in earnings 0 0 0
Included in regulatory assets and liabilities 23 158 8
Purchases 0 0 0
Settlements (11) (157) 1
Issuances 0 0 0
Transfers in 1 0 0
Transfers out 2 0 0
Fair value of net derivatives based on significant unobservable inputs at December 31 24 9 8
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 $ 974