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Derivative Instruments (Reconciliation of Changes in the Fair Value) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Realized and unrealized gains (losses): [Abstract]    
Fair value based on significant unobservable inputs, ending balance $ 667 $ 456
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 951 (854)
Realized and unrealized gains (losses): [Abstract]    
Included in operating revenues 33 1,208
Included in regulatory assets and liabilities (16) (17)
Purchases 23 214
Settlements (299) (304)
Issuances (29) (74)
Transfers out 0 274
Gains (losses) included in operating revenues attributable to the change in unrealized gains (losses) relating to derivatives held at the reporting date (79) 797
Transfers in 4 9
Florida Power & Light Company    
Realized and unrealized gains (losses): [Abstract]    
Fair value based on significant unobservable inputs, ending balance 2 (11)
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 24 9
Realized and unrealized gains (losses): [Abstract]    
Included in operating revenues 0 0
Included in regulatory assets and liabilities (16) (17)
Purchases 0 0
Settlements (6) (3)
Issuances 0 0
Transfers out 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
Transfers in 0 $ 0
Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial and Nonfinancial Liabilities, Fair Value Disclosure $ 931