Employee Retirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Pension Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Service cost	$ 17	$ 18
Interest cost	34	33
Expected return on plan assets	(103)	(102)
Special termination benefits	0	28
Net periodic cost (income) cost	(52)	(23)
Postretirement Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Service cost	0	0
Interest cost	2	2
Expected return on plan assets	0	0
Special termination benefits	0	0
Net periodic cost (income) cost	2	2
Florida Power & Light Company | Pension Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Net periodic cost (income) cost	(30)	(9)
Florida Power & Light Company | Postretirement Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Net periodic cost (income) cost	$ 2	$ 2