Reinsurance - Schedule of Assets and Liabilities Held in Support of Reserves (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Assets
Total assets	$ 14,722	$ 15,195
Liabilities
Total liabilities	14,511	14,960
Derivatives related to funds withheld under reinsurance treaties
Liabilities
Net fair value, derivative asset (liability)	1,772	1,748
Funds withheld embedded derivative \| Derivatives related to funds withheld under reinsurance treaties
Liabilities
Net fair value, derivative asset (liability)	1,765	1,752
Debt securities, available-for-sale
Assets
Total assets	7,476	7,947
Debt securities, at fair value under the fair value option
Assets
Total assets	6	6
Equity securities
Assets
Total assets	69	88
Mortgage loans
Assets
Total assets	2,022	2,102
Mortgage loans, at fair value under the fair value option
Assets
Total assets	196	324
Policy loans
Assets
Total assets	3,567	3,548
Freestanding derivative instruments, net
Assets
Total assets	7	(4)
Other invested assets
Assets
Total assets	674	712
Cash and cash equivalents
Assets
Total assets	626	375
Accrued investment income
Assets
Total assets	87	92
Other assets and liabilities, net
Assets
Total assets	(8)	5
Funds held under reinsurance treaties
Liabilities
Total liabilities	$ 14,511	$ 14,960