Reinsurance - Gains and Losses on Funds Withheld Reinsurance Treaties (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Available-for-sale securities
Realized gains on sale	$ 2	$ 5	$ 6	$ 29
Realized losses on sale	(18)	(63)	(43)	(241)
Credit loss expense on mortgage loans	(16)	4	(67)	14
Net gains (losses) on derivative instruments			(4,730)	1,497	[1]
Net gains (losses) on funds withheld payable under reinsurance treaties			(807)	2,105	[1]
Embedded derivative gain (loss)	(1,973)	4,343	(5,010)	4,209
Funds withheld assets
Available-for-sale securities
Realized gains on sale	11	3	16	40
Realized losses on sale	(10)	(4)	(48)	(31)
Credit loss expense	13	(12)	2	(40)
Credit loss expense on mortgage loans	(4)	13	(7)	11
Other	3	(43)	12	(59)
Net gains (losses) on non-derivative investments	13	(43)	(25)	(79)
Net gains (losses) on derivative instruments	(14)	63	(23)	84
Net gains (losses) on funds withheld payable under reinsurance treaties	(133)	1,057	(759)	2,100
Total net gains (losses) on derivatives and investments	(134)	1,077	(807)	2,105
Derivatives related to funds withheld under reinsurance treaties
Available-for-sale securities
Embedded derivative gain (loss)	99	1,410	(280)	2,712
Derivatives related to funds withheld under reinsurance treaties | Funds withheld embedded derivative
Available-for-sale securities
Embedded derivative gain (loss)	$ 113	$ 1,347	$ (257)	$ 2,628

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