Investments - Schedule of Increase (Decrease) in Payables for Collateral on Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Investments [Abstract]
Collateral payable for derivative investments	$ 1,942	$ 1,917	$ (2,355)
Securities pledged under securities lending agreements	(48)	(93)	57
Investments pledged for FHLBI	0	(480)	0
Total increase (decrease) in payables for collateral on investments	$ 1,894	$ 1,344	$ (2,298)