Long-duration Contracts - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended			12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Mar. 31, 2022	Jun. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2022	Dec. 31, 2022	Jan. 01, 2022	Dec. 31, 2021
Additional Liability, Long-Duration Insurance [Line Items]
Future policy benefit, interest expense					$ 1,194	$ 802
Market risk benefit, period increase (decrease)					101	(2,167)
Effect of changes in interest rates					609	2,093	$ 2,093
Effect of changes in instrument-specific credit risk	$ 146	$ (524)			146	(524)	(524)	$ (366)
Attributed fees collected					252	247	247
Effect of changes in equity					(26)	188	188
Remeasurement gains (losses) on future policy benefits related to discount rate	1,317	2,374	$ 3,562	$ 6,459	1,328	8,833		8,425
Remeasurement gains (losses) on market risk benefits related to credit risk	(254)	(52)	$ 397	$ 576	(220)	524		366
Liability for Future Policy Benefit, Adverse Development, Expense					110	38
Payout annuities with life contingencies
Additional Liability, Long-Duration Insurance [Line Items]
Favorable (unfavorable) movements					4,418	237
Interest accrual					1,194		802
Benefit payments					(2,731)		(2,193)
Effect of changes in discount rate assumptions	$ 9,753	$ 8,833			9,753	8,833	8,833	8,425	$ 0
Issuances					9,120		$ 10,666
Remeasurement gains (losses) on future policy benefits related to discount rate					$ 1,328	$ 8,833
Effect of changes in cash flow assumptions								$ (297)		$ 0