Employee Retirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Pension Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Service cost	$ 16	$ 22
Interest cost	33	19
Expected return on plan assets	(98)	(91)
Amortization of actuarial loss	0	0
Amortization of prior service benefit	0	0
Net periodic cost (income) cost	(49)	(50)
Postretirement Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Service cost	0	0
Interest cost	3	1
Expected return on plan assets	0	0
Amortization of actuarial loss	0	1
Amortization of prior service benefit	0	(1)
Net periodic cost (income) cost	3	1
Florida Power & Light Company | Pension Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Net periodic cost (income) cost	(32)	(34)
Florida Power & Light Company | Postretirement Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Net periodic cost (income) cost	$ 2	$ 1