v3.26.3
Employee Retirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Pension Benefits [Member]        
Net periodic benefit (income) cost [Abstract]        
Service cost $ 19 $ 18 $ 57 $ 52
Interest cost 32 34 96 102
Expected return on plan assets (106) (103) (317) (310)
Amortization of prior service benefit 0 (1) 0 (1)
Special termination benefits 0 0 75 0
Net periodic cost (income) cost (55) (52) (89) (157)
Postretirement Benefits [Member]        
Net periodic benefit (income) cost [Abstract]        
Service cost 0 0 1 1
Interest cost 1 2 5 6
Expected return on plan assets 0 0 0 0
Amortization of prior service benefit 0 0 0 0
Special termination benefits 0 0 0 0
Net periodic cost (income) cost 1 2 6 7
Florida Power & Light Company | Pension Benefits [Member]        
Net periodic benefit (income) cost [Abstract]        
Net periodic cost (income) cost (30) (30) (63) (90)
Florida Power & Light Company | Postretirement Benefits [Member]        
Net periodic benefit (income) cost [Abstract]        
Net periodic cost (income) cost $ 1 $ 2 $ 4 $ 6