Employee Retirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Pension Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Service cost	$ 19	$ 17
Interest cost	32	34
Expected return on plan assets	(106)	(103)
Net periodic cost (income) cost	(55)	(52)
Postretirement Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Service cost	0	0
Interest cost	2	2
Expected return on plan assets	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)	(30)
Florida Power & Light Company | Postretirement Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Net periodic cost (income) cost	$ 2	$ 2