Employee Retirement Benefits - Plan Assets, Benefit Obligations and Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Other Postretirement Benefits Plan [Member]
Change in pension benefit obligation:
Service cost	$ 1	$ 1	$ 1
Interest cost	9	9	5
Special termination benefits	0	0	0
Funded status:
Prepaid (accrued) benefit cost	(212)	(231)
Pension Benefits [Member]
Change in pension plan assets:
Plan assets, beginning balance	4,897	4,543
Actual return on plan assets	469	591
Benefit payments	(245)	(237)
Plan assets, ending balance	5,121	4,897	4,543
Change in pension benefit obligation:
Obligation, beginning balance	2,785	2,711
Service cost	71	64	86
Interest cost	131	132	77
Special termination benefits	(27)	0	(52)
Plan amendments	3	0
Actuarial losses (gains) – net(b)	(141)	115
Benefit payments	(245)	(237)
Obligation, ending balance	2,625	2,785	$ 2,711
Funded status:
Prepaid (accrued) benefit cost	2,496	2,112
Accumulated benefit obligation	2,553	2,719
FPL [Member] | Other Postretirement Benefits Plan [Member]
Funded status:
Prepaid (accrued) benefit cost	(86)	(101)
FPL [Member] | Pension Benefits [Member]
Funded status:
Prepaid (accrued) benefit cost	$ 1,954	$ 1,853