Market Risk Benefits - Balances of and Changes in Market Risk Benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022		Dec. 31, 2021
Market Risk Benefit [Roll Forward]
Beginning balance	$ 360	$ 1,937	$ 1,103	$ 2,901	$ 2,901		$ 4,829
Issuances	5	6	13	22	27		45
Interest accrual and time decay	(15)	(38)	(36)	(175)	(237)		(294)
Reserve increase from attributed fees collected	202	206	585	605	810		819
Reserve release for benefit payments and derecognition	(6)	(6)	(24)	(15)	(29)		(8)
Effect of changes in interest rates and bond markets	(1,241)	(1,147)	(1,325)	(3,949)	(4,193)		(1,053)
Effect of changes in equity markets and subaccount performance	500	643	(402)	2,943	2,258		(1,558)
Effect of changes in equity index volatility	(13)	47	(83)	123	205		73
Actual policyholder behavior different from expected behavior	(16)	(21)	(10)	11	17		52
Effect of changes in other future expected assumptions	128	(139)	128	(139)	(139)		123
Effect of changes in the instrument-specific credit risk on market risk benefits	(23)	4	(68)	(835)	(517)		(127)
Ending balance	(119)	1,492	(119)	1,492	1,103		2,901
Reconciliation of the gross balances in an asset or liability position:
Asset position	1,644	845	1,644	845	1,015	[1]	539
Liability position	(1,525)	(2,337)	(1,525)	(2,337)	(2,118)	[1]	(3,440)
Net asset (liability) position	$ 119	$ (1,492)	$ 119	$ (1,492)	$ (1,103)		$ (2,901)
Weighted average attained age of contractholders	69 years	68 years	69 years	68 years	68 years		68 years
Changes in unrealized (gains) losses in net income relating to liabilities held at end of period	$ (650)	$ (649)	$ (1,681)	$ (1,151)	$ (2,044)		$ (2,502)
Changes in unrealized (gains) losses in other comprehensive income relating to liabilities held at end of period	(23)	2	(67)	(826)	(505)		(102)
Death benefits
Reconciliation of the gross balances in an asset or liability position:
Guaranteed benefit amount in excess of current account balances (net amount at risk)	2,091	3,987	2,091	3,987	2,781		251
Living benefits
Reconciliation of the gross balances in an asset or liability position:
Guaranteed benefit amount in excess of current account balances (net amount at risk)	3,693	3,354	3,693	3,354	3,364		195
Composite (greater of)
Reconciliation of the gross balances in an asset or liability position:
Guaranteed benefit amount in excess of current account balances (net amount at risk)	$ 5,470	$ 6,905	$ 5,470	$ 6,905	5,830		441
Previously Reported
Market Risk Benefit [Roll Forward]
Beginning balance							3,084
Reconciliation of the gross balances in an asset or liability position:
Asset position					0		0
Liability position					$ 0		0
Net asset (liability) position
Effect of shadow reserve adjustments
Market Risk Benefit [Roll Forward]
Beginning balance							(3)
Reconciliation of the gross balances in an asset or liability position:
Net asset (liability) position
Adjustments for the cumulative effect of the changes in instrument-specific credit risk on market risk benefits between the original contract issuance date and the transition date
Market Risk Benefit [Roll Forward]
Beginning balance							670
Reconciliation of the gross balances in an asset or liability position:
Net asset (liability) position
Adjustments to the host contract for differences between previous carrying amount and fair value measurement for the market risk benefits under the option-based method of valuation
Market Risk Benefit [Roll Forward]
Beginning balance							20
Reconciliation of the gross balances in an asset or liability position:
Net asset (liability) position
Adjustments for the remaining difference (exclusive of the instrument-specific credit risk change and host contract adjustments) between previous carrying amount and fair value measurements for the market risk benefits
Market Risk Benefit [Roll Forward]
Beginning balance							$ 1,058
Reconciliation of the gross balances in an asset or liability position:
Net asset (liability) position

[1] Certain prior period amounts have been restated. See Note 3 for more information.