Closed Block (Liabilities and Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Closed Block Liabilities
Future policy benefits	$ 35,806	$ 36,142
Other policy-related balances	301	319
Policyholder dividends payable	170	174
Policyholder dividend obligation	0	0
Current income tax payable	1	0
Other liabilities	746	668
Total closed block liabilities	37,024	37,303
Assets Designated to the Closed Block
Fixed maturity securities available-for-sale, at estimated fair value	19,637	19,939
Equity securities, at estimated fair value	11	10
Mortgage loans	6,005	6,151
Policy loans	3,919	3,960
Real estate and real estate joint ventures	676	668
Other invested assets	485	496
Total investments	30,733	31,224
Cash and cash equivalents	717	717
Accrued investment income	385	383
Premiums, reinsurance and other receivables	52	54
Current income tax recoverable	0	3
Deferred income tax asset	359	312
Total assets designated to the closed block	32,246	32,693
Excess of closed block liabilities over assets designated to the closed block	4,778	4,610
AOCI:
Unrealized investment gains (losses), net of income tax	(1,044)	(820)
Unrealized gains (losses) on derivatives, net of income tax	151	130
Total amounts included in AOCI	(893)	(690)
Maximum future earnings to be recognized from closed block assets and liabilities	$ 3,885	$ 3,920