Employee Retirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Pension Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Service cost	$ 18	$ 17	$ 52	$ 53
Interest cost	34	33	102	99
Expected return on plan assets	(103)	(100)	(310)	(304)
Amortization of prior service benefit	(1)	0	(1)	0
Special termination benefits	0	(1)	0	27
Net periodic cost (income) cost	(52)	(51)	(157)	(125)
Postretirement Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Service cost	0	0	1	1
Interest cost	2	2	6	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	2	2	7	7
Florida Power & Light Company | Pension Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Net periodic cost (income) cost	(30)	(32)	(90)	(72)
Florida Power & Light Company | Postretirement Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Net periodic cost (income) cost	$ 2	$ 2	$ 6	$ 6