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Derivative Instruments (Reconciliation of Changes in the Fair Value) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Realized and unrealized gains (losses): [Abstract]        
Fair value based on significant unobservable inputs, ending balance $ 691 $ (1,676) $ 691 $ (1,676)
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 755 (1,594) (854) 170
Realized and unrealized gains (losses): [Abstract]        
Included in operating revenues 87 (695) 2,114 (3,215)
Included in regulatory assets and liabilities (2) 92 5 161
Purchases 27 90 356 469
Settlements (320) 482 (1,045) 1,043
Issuances (18) (57) (119) (289)
Transfers out 223 6 280 (15)
Gains (losses) included in operating revenues attributable to the change in unrealized gains (losses) relating to derivatives held at the reporting date 85 (446) 994 (2,081)
Transfers in (61) 0 (46) 0
Florida Power & Light Company        
Realized and unrealized gains (losses): [Abstract]        
Fair value based on significant unobservable inputs, ending balance 7 21 7 21
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 13 83 9 8
Realized and unrealized gains (losses): [Abstract]        
Included in operating revenues 0 0 0 0
Included in regulatory assets and liabilities (2) 92 5 161
Purchases 0 0 0 0
Settlements (6) (154) (9) (148)
Issuances 0 0 0 0
Transfers out 2 0 2 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 $ 1,074   $ 1,074