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Employee Retirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Pension Benefits [Member]        
Net periodic benefit (income) cost [Abstract]        
Service cost $ 16 $ 21 $ 32 $ 43
Interest cost 33 20 66 39
Expected return on plan assets (98) (90) (196) (181)
Amortization of actuarial loss 0 0 0 0
Amortization of prior service benefit 0 (1) 0 (1)
Special termination benefits 0 52 0 52
Net periodic cost (income) cost (49) 2 (98) (48)
Postretirement Benefits [Member]        
Net periodic benefit (income) cost [Abstract]        
Service cost 1 1 1 1
Interest cost 1 1 4 2
Expected return on plan assets 0 0 0 0
Amortization of actuarial loss 0 0 0 1
Amortization of prior service benefit 0 (1) 0 (2)
Special termination benefits 0 0 0 0
Net periodic cost (income) cost 2 1 5 2
Florida Power & Light Company | Pension Benefits [Member]        
Net periodic benefit (income) cost [Abstract]        
Net periodic cost (income) cost (32) 7 (64) (27)
Florida Power & Light Company | Postretirement Benefits [Member]        
Net periodic benefit (income) cost [Abstract]        
Net periodic cost (income) cost $ 2 $ 1 $ 4 $ 2