Employee Retirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Pension Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Service cost	$ 21	$ 22	$ 43	$ 45
Interest cost	20	16	39	32
Expected return on plan assets	(90)	(85)	(181)	(170)
Amortization of actuarial loss	0	6	0	12
Amortization of prior service benefit	(1)	0	(1)	0
Special termination benefits	52	0	52	0
Net periodic cost (income) cost	2	(41)	(48)	(81)
Postretirement Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Service cost	1	0	1	1
Interest cost	1	1	2	2
Expected return on plan assets	0	0	0	0
Amortization of actuarial loss	0	2	1	3
Amortization of prior service benefit	(1)	(4)	(2)	(8)
Special termination benefits	0	0	0	0
Net periodic cost (income) cost	1	(1)	2	(2)
Florida Power & Light Company | Pension Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Net periodic cost (income) cost	7	(27)	(27)	(54)
Florida Power & Light Company | Postretirement Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Net periodic cost (income) cost	$ 1	$ (1)	$ 2	$ (2)