Insurance (Market Risk Benefit) (Details) - USD ($) $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2021	Dec. 31, 2020
Variable Annuities
Market Risk Benefit [Line Items]
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk	$ 8,198	$ 11,121	$ 9,997	$ 15,726		$ 18,421
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change	6,508	9,543	8,253	11,639		$ 14,969
Market Risk Benefit, Decrement	(114)	20	16	(70)
Market Risk Benefit, Increase (Decrease) from Future Expected Policyholder Behavior Assumption	259	212	212	41
Market Risk Benefit, Increase (Decrease) from Actual Policyholder Behavior Different from Expected	178	(333)	(48)	(86)
Market Risk Benefit, Increase (Decrease) from Interest Rate Change	(2,360)	(8,396)	(8,397)	(1,831)
Market Risk Benefit, Increase (Decrease) from Equity Market Change	(669)	5,605	3,806	(2,578)
Market Risk Benefit, Issuance	(9)	(29)	(47)	(96)
Market Risk Benefit, Effect of changes in risk margin	(52)	(120)	(152)	(128)
Market Risk Benefit, Aging of the Block and Other	1,022	945	1,224	1,418
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, before Tax	1,690	1,578	1,744	4,087
Market Risk Benefit, Reinsurance Recoverable, after Allowance	35	76	71	118	$ 169
Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change	$ 8,163	$ 11,045	$ 9,926	$ 15,608	$ 18,252
Market Risk Benefit, Weighted-Average Attained Age of Contract holder	72 years 8 months 12 days	71 years 7 months 6 days	71 years 9 months 18 days	71 years 1 month 6 days
Index-linked Annuities
Market Risk Benefit [Line Items]
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk	$ (7)	$ 2	$ 2	$ 5