Employee Retirement Benefits - Net Periodic Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Service cost	$ 71	$ 64	$ 86
Interest cost	131	132	77
Expected return on plan assets	(405)	(392)	(363)
Amortization of actuarial loss	0	0	0
Amortization of prior service benefit	0	0	(1)
Special termination benefits	27	0	52
Benefit plan settlement	0	0	27
Net periodic (income) cost	(176)	(196)	(122)
Other Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Service cost	1	1	1
Interest cost	9	9	5
Expected return on plan assets	0	0	0
Amortization of actuarial loss	0	0	3
Amortization of prior service benefit	0	0	(4)
Special termination benefits	0	0	0
Benefit plan settlement	0	0	0
Net periodic (income) cost	10	10	5
FPL [Member] | Pension Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Net periodic (income) cost	(103)	(127)	(76)
FPL [Member] | Other Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Net periodic (income) cost	$ 8	$ 8	$ 4