Employee Retirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Pension Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Service cost	$ 17	$ 16	$ 53	$ 48
Interest cost	33	33	99	99
Expected return on plan assets	(100)	(98)	(304)	(294)
Special termination benefits	(1)	0	27	0
Net periodic cost (income) cost	(51)	(49)	(125)	(147)
Postretirement Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Service cost	0	0	1	1
Interest cost	2	3	6	7
Expected return on plan assets	0	0	0	0
Special termination benefits	0	0	0	0
Net periodic cost (income) cost	2	3	7	8
Florida Power & Light Company | Pension Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Net periodic cost (income) cost	(32)	(32)	(72)	(96)
Florida Power & Light Company | Postretirement Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Net periodic cost (income) cost	$ 2	$ 2	$ 6	$ 6