Employee Retirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Pension Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Service cost	$ 21	$ 23	$ 64	$ 68
Interest cost	19	16	58	48
Expected return on plan assets	(90)	(85)	(271)	(255)
Amortization of actuarial loss	0	6	0	18
Amortization of prior service benefit	0	0	(1)	(1)
Special termination benefits	0	0	52	0
Net periodic cost (income) cost	(50)	(40)	(98)	(122)
Postretirement Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Service cost	0	1	1	1
Interest cost	2	1	4	3
Expected return on plan assets	0	0	0	0
Amortization of actuarial loss	1	1	2	4
Amortization of prior service benefit	(1)	(4)	(3)	(11)
Special termination benefits	0	0	0	0
Net periodic cost (income) cost	2	(1)	4	(3)
Florida Power & Light Company | Pension Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Net periodic cost (income) cost	(33)	(27)	(60)	(81)
Florida Power & Light Company | Postretirement Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Net periodic cost (income) cost	$ 1	$ (1)	$ 3	$ (3)