Employee Retirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Pension Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Service cost	$ 22	$ 22
Interest cost	19	16
Expected return on plan assets	(91)	(85)
Amortization of prior service benefit	0	0
Amortization of actuarial loss	0	6
Net periodic cost (income) cost	(50)	(41)
Postretirement Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Service cost	0	1
Interest cost	1	1
Expected return on plan assets	0	0
Amortization of prior service benefit	(1)	(4)
Amortization of actuarial loss	1	1
Net periodic cost (income) cost	1	(1)
Florida Power & Light Company | Pension Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Net periodic cost (income) cost	(34)	(27)
Florida Power & Light Company | Postretirement Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Net periodic cost (income) cost	$ 1	$ (1)