Insurance (Future Policy Benefits - SOP) (Details) - ULSG - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Additional Liability, Long-Duration Insurance [Line Items]
Additional Liability, Long-Duration Insurance, before Reinsurance, after Discount Rate Change	$ 7,123	$ 6,986	$ 6,935	$ 7,168
Additional Liability, Long-Duration Insurance, Original Discount Rate, before Cash Flow and Reinsurance	7,294	6,830	$ 7,175	$ 6,731
Additional Liability, Long-Duration Insurance, Cumulative Increase (Decrease) from Cash Flow Change		0			$ 0
Additional Liability, Long-Duration Insurance, Cumulative Increase (Decrease) of Actual Variance from Expected Experience		34			66
Additional Liability, Long-Duration Insurance, Original Discount Rate, before Reinsurance, after Cash Flow Change		7,209			$ 6,797
Additional Liability, Long-Duration Insurance, Interest Income (Expense)	87	81
Additional Liability, Long-Duration Insurance, Net Premium Collected	101	110
Additional Liability, Long-Duration Insurance, Benefit Payment	(103)	(159)
Additional Liability, Long-Duration Insurance, Remeasurement Gain (Loss)	0	1
AOCI, Liability for Future Policy Benefit, before Tax	(171)	156
Additional Liability, Long-Duration Insurance, Reinsurance Recoverable, after Allowance	1,397	1,304
Additional Liability, Long-Duration Insurance, after Reinsurance	$ 5,726	$ 5,682
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	4.91%	4.90%
Additional Liability, Long-Duration Insurance, Gross Premium Income	$ 0	$ 0