Employee Retirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pension Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Service cost	$ 16	$ 21	$ 48	$ 64
Interest cost	33	19	99	58
Expected return on plan assets	(98)	(90)	(294)	(271)
Amortization of actuarial loss	0	0	0	0
Amortization of prior service benefit	0	0	0	(1)
Special termination benefits	0	0	0	52
Net periodic cost (income) cost	(49)	(50)	(147)	(98)
Postretirement Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Service cost	0	0	1	1
Interest cost	3	2	7	4
Expected return on plan assets	0	0	0	0
Amortization of actuarial loss	0	1	0	2
Amortization of prior service benefit	0	(1)	0	(3)
Special termination benefits	0	0	0	0
Net periodic cost (income) cost	3	2	8	4
Florida Power & Light Company | Pension Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Net periodic cost (income) cost	(32)	(33)	(96)	(60)
Florida Power & Light Company | Postretirement Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Net periodic cost (income) cost	$ 2	$ 1	$ 6	$ 3