Insurance Liabilities (Future Policy Benefits - SOP) (Details) - ULSG - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Additional Liability, Long-Duration Insurance [Line Items]
Additional Liability, Long-Duration Insurance, before Reinsurance, after Discount Rate Change	$ 7,686	$ 7,123	$ 7,607	$ 6,935
Additional Liability, Long-Duration Insurance, Original Discount Rate, before Cash Flow and Reinsurance	7,906	7,294	7,784	7,175
Additional Liability, Long-Duration Insurance, Cumulative Increase (Decrease) of Actual Variance from Expected Experience			40	34
Additional Liability, Long-Duration Insurance, Original Discount Rate, before Reinsurance, after Cash Flow Change			$ 7,824	$ 7,209
Additional Liability, Long-Duration Insurance, Interest Income (Expense)	94	87
Additional Liability, Long-Duration Insurance, Net Premium Collected	103	101
Additional Liability, Long-Duration Insurance, Benefit Payment	(115)	(103)
AOCI, Liability for Future Policy Benefit, before Tax	(220)	(171)
Additional Liability, Long-Duration Insurance, Reinsurance Recoverable, after Allowance	1,447	1,397
Additional Liability, Long-Duration Insurance, after Reinsurance	$ 6,239	$ 5,726
Additional Liability, Long-Duration Insurance, Weighted-Average Duration	6 years 8 months 12 days	6 years 8 months 12 days
Additional Liability, Long-Duration Insurance, Weighted-Average Interest Accretion Rate	4.93%	4.91%
Additional Liability, Long-Duration Insurance, Gross Premium Income	$ 254	$ 256