Reinsurance - Assets and Liabilities Held in Support of Reserves (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Assets
Total assets	$ 21,417	$ 23,226
Liabilities
Total liabilities	21,170	22,957	[1]
Derivatives related to funds withheld under reinsurance treaties
Liabilities
Net fair value, derivative asset (liability)	2,935	3,236
Funds withheld embedded derivative | Derivatives related to funds withheld under reinsurance treaties
Liabilities
Net fair value, derivative asset (liability)	2,901	3,158
Debt securities, available-for-sale
Assets
Total assets	12,085	13,622
Debt securities, at fair value under the fair value option
Assets
Total assets	161	159
Equity securities
Assets
Total assets	148	77
Mortgage loans
Assets
Total assets	3,302	4,127
Mortgage loans, at fair value under the fair value option
Assets
Total assets	509	582
Policy loans
Assets
Total assets	3,451	3,435
Freestanding derivative instruments, net
Assets
Total assets	34	78
Other invested assets
Assets
Total assets	638	793
Cash and cash equivalents
Assets
Total assets	987	260
Accrued investment income
Assets
Total assets	151	166
Other assets and liabilities, net
Assets
Total assets	(49)	(73)
Funds held under reinsurance treaties
Liabilities
Total liabilities	$ 21,170	$ 22,957

[1] (1) Recast for the adoption of ASU 2018-12. See Notes 1 and 2 to the Condensed Consolidated Financial Statements.