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Employee Retirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Pension Benefits [Member]        
Net periodic benefit (income) cost [Abstract]        
Service cost $ 18 $ 16 $ 36 $ 32
Interest cost 33 33 66 66
Expected return on plan assets (102) (98) (204) (196)
Special termination benefits 0 0 28 0
Net periodic cost (income) cost (51) (49) (74) (98)
Postretirement Benefits [Member]        
Net periodic benefit (income) cost [Abstract]        
Service cost 1 1 1 1
Interest cost 2 1 4 4
Expected return on plan assets 0 0 0 0
Special termination benefits 0 0 0 0
Net periodic cost (income) cost 3 2 5 5
Florida Power & Light Company | Pension Benefits [Member]        
Net periodic benefit (income) cost [Abstract]        
Net periodic cost (income) cost (31) (32) (40) (64)
Florida Power & Light Company | Postretirement Benefits [Member]        
Net periodic benefit (income) cost [Abstract]        
Net periodic cost (income) cost $ 2 $ 2 $ 4 $ 4