Income Taxes - Components of Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Federal:
Current	$ 507	$ 11	$ (26)
Deferred	368	497	311
Total federal	875	508	285
State:
Current	161	41	(62)
Deferred	(30)	37	125
Total state	131	78	63
Total income taxes	1,006	586	348
FPL [Member]
Federal:
Current	990	3	85
Deferred	(179)	684	545
Total federal	811	687	630
State:
Current	294	2	1
Deferred	18	258	207
Total state	312	260	208
Total income taxes	$ 1,123	$ 947	$ 838