Investments - Net Gains (Losses) on Derivatives and Investments (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
	Jul. 01, 2023	Jun. 30, 2023	Jun. 30, 2022		Jun. 30, 2023	Jun. 30, 2022	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 income (expense)		0	1		(11)		1
Credit loss income (expense) on mortgage loans		(13)	(9)		(60)		3
Other		(11)	71		0		83
Net gains (losses) excluding derivatives and funds withheld assets		(40)	5		(108)		(125)
Net gains (losses) on derivative instruments		(1,973)	4,343		(5,010)		4,209
Net gains (losses) on derivatives and investments		(2,112)	2,938	[1]	(4,838)		1,372	[1]
Net gains (losses) on funds withheld reinsurance treaties		(134)	1,077	[1]	(807)		2,105	[1]
Total net gains (losses) on derivatives and investments	$ 4,015	(2,246)	4,015	[1]	(5,645)	$ 3,477	3,477	[1]
Derivatives excluding funds withheld under reinsurance treaties
Available-for-sale securities
Net gains (losses) on derivative instruments		(2,072)	2,933		(4,730)		1,497
Derivatives related to funds withheld under reinsurance treaties
Available-for-sale securities
Net gains (losses) on derivative instruments		99	1,410		(280)		2,712
Net gains (losses) on funds withheld reinsurance treaties		$ (134)	$ 1,077		$ (807)		$ 2,105

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