Market Risk Benefits (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2021	Dec. 31, 2020
Market Risk Benefit [Line Items]
Market Risk Benefit, Net Amount at Risk	$ 261		$ 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	259	$ 233	247	262
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change	(18)	14	263	254
Market Risk Benefit, Interest Expense	4	0
Market Risk Benefit, Attributed Fee Collected	6	7
Market Risk Benefit, Benefit Payment	0	(5)
Market Risk Benefit, Increase (Decrease) from Future Expected Policyholder Behavior Assumption	21	(61)
Market Risk Benefit, Increase (Decrease) from Interest Rate Change	(17)	13
Market Risk Benefit, Increase (Decrease) from Equity Market Change	(5)	3
Market Risk Benefit, Increase (Decrease) from Volatility	0	2
Market Risk Benefit, Increase (Decrease) from Other Assumption	5	6
Market Risk Benefit, Increase (Decrease) from Actual Policyholder Behavior Different from Expected	277	219
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, before Tax	259	233
Market Risk Benefit, Reinsurance Recoverable, after Allowance	0	0
Market Risk Benefit, Net Amount at Risk	$ 1,428	$ 1,220
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age	71 years	68 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, Reinsurance Recoverable, after Allowance			$ 0	$ 0	$ 0