Market Risk Benefits (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
Market Risk Benefit [Line Items]
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk	$ 216	$ 259
Market Risk Benefit, Net Amount at Risk	224		$ 247
Accounting Standards Update 2018-12
Market Risk Benefit [Line Items]
Market Risk Benefit, Net Amount at Risk			247	$ 262
Insurance, Other | Americas [Member] | Other Segments
Market Risk Benefit [Line Items]
Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change	216	259	247	262
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change	225	283	263	254
Market Risk Benefit, Interest Expense	9	21
Market Risk Benefit, Attributed Fee Collected	19	7
Market Risk Benefit, Benefit Payment	1	1
Market Risk Benefit, Increase (Decrease) from Future Expected Policyholder Behavior Assumption	16	19
Market Risk Benefit, Increase (Decrease) from Interest Rate Change	(54)	(40)
Market Risk Benefit, Increase (Decrease) from Equity Market Change	(25)	17
Market Risk Benefit, Increase (Decrease) from Volatility	(5)	4
Market Risk Benefit, Increase (Decrease) from Other Assumption	(11)	1
Market Risk Benefit, Increase (Decrease) from Actual Policyholder Behavior Different from Expected	12	(1)
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, before Tax	(9)	(24)
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk	216	259
Market Risk Benefit, Reinsurance Recoverable, after Allowance	0	0
Market Risk Benefit, Net Amount at Risk	$ 1,375	$ 1,540
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age	71 years	66 years
Insurance, Other | Americas [Member] | Accounting Standards Update 2018-12 | Other Segments
Market Risk Benefit [Line Items]
Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change			247	262	$ 266	$ 266
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change			263	254	266	$ 311
Market Risk Benefit, Interest Expense			54	3
Market Risk Benefit, Attributed Fee Collected			28	12
Market Risk Benefit, Benefit Payment			(9)	(14)
Market Risk Benefit, Increase (Decrease) from Future Expected Policyholder Behavior Assumption			18	25
Market Risk Benefit, Increase (Decrease) from Interest Rate Change			(175)	(51)
Market Risk Benefit, Increase (Decrease) from Equity Market Change			48	(49)
Market Risk Benefit, Increase (Decrease) from Volatility			19	(2)
Market Risk Benefit, Increase (Decrease) from Other Assumption			7	5
Market Risk Benefit, Increase (Decrease) from Actual Policyholder Behavior Different from Expected			19	14
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, before Tax			(16)	8
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk			247	262
Market Risk Benefit, Reinsurance Recoverable, after Allowance			$ 0	$ 0	$ 0