Audited Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions		9 Months Ended	12 Months Ended
	Dec. 01, 2021	Dec. 31, 2022	Dec. 31, 2023
Statement of Cash Flows [Abstract]
Novations, investments		$ 4,635	$ 491
Novations, modified coinsurance payable		(4,635)	491
Noncash or part noncash acquisition, investments acquired	$ 2,600
Payments of dividends	$ 200	$ 0	45
Securities as collateral			$ 52