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Derivative Instruments (Reconciliation of Changes in the Fair Value) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Realized and unrealized gains (losses): [Abstract]        
Fair value based on significant unobservable inputs, ending balance $ 755 $ (1,594) $ 755 $ (1,594)
Derivative Financial Instruments, Net [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value based on significant unobservable inputs, beginning balance 456 (1,072) (854) 170
Realized and unrealized gains (losses): [Abstract]        
Included in operating revenues 820 (986) 2,028 (2,520)
Included in regulatory assets and liabilities 25 88 8 69
Purchases 111 197 329 379
Settlements (416) 311 (725) 561
Issuances (28) (134) (102) (232)
Transfers out (219) 2 55 (21)
Gains (losses) included in operating revenues attributable to the change in unrealized gains (losses) relating to derivatives held at the reporting date 738 (817) 1,375 (2,065)
Transfers in 6 0 16 0
Florida Power & Light Company        
Realized and unrealized gains (losses): [Abstract]        
Fair value based on significant unobservable inputs, ending balance 13 83 13 83
Florida Power & Light Company | Derivative Financial Instruments, Net [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value based on significant unobservable inputs, beginning balance (11) (10) 9 8
Realized and unrealized gains (losses): [Abstract]        
Included in operating revenues 0 0 0 0
Included in regulatory assets and liabilities 25 88 8 69
Purchases 0 0 0 0
Settlements (1) 5 (4) 6
Issuances 0 0 0 0
Transfers out 0 0 0 0
Gains (losses) included in operating revenues attributable to the change in unrealized gains (losses) relating to derivatives held at the reporting date 0 0 0 0
Transfers in 0 $ 0 0 $ 0
Level 3        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Financial and Nonfinancial Liabilities, Fair Value Disclosure $ 1,415   $ 1,415