Market Risk Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Market Risk Benefit [Line Items]
Market risk benefits, at fair value	$ 228		$ 258
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	214	$ 259	249	$ 247
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change	(4)	(18)	$ 253	$ 263
Market Risk Benefit, Interest Expense	3	4
Market Risk Benefit, Attributed Fee Collected	6	6
Market Risk Benefit, Benefit Payment	0	0
Market Risk Benefit, Increase (Decrease) from Future Expected Policyholder Behavior Assumption	(25)	21
Market Risk Benefit, Increase (Decrease) from Interest Rate Change	(21)	(17)
Market Risk Benefit, Increase (Decrease) from Equity Market Change	0	(5)
Market Risk Benefit, Increase (Decrease) from Volatility	(4)	0
Market Risk Benefit, Increase (Decrease) from Other Assumption	6	5
Market Risk Benefit, Increase (Decrease) from Actual Policyholder Behavior Different from Expected	218	277
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, before Tax	214	259
Market Risk Benefit, Reinsurance Recoverable, after Allowance	0	0
Market risk benefits, at fair value	$ 1,329	$ 1,428
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age	71 years	71 years