Insurance Liabilities (Future Policy Benefits - SOP) (Details) - ULSG - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Additional Liability, Long-Duration Insurance [Line Items]
Additional Liability, Long-Duration Insurance, before Reinsurance, after Discount Rate Change	$ 7,607	$ 6,935	$ 7,168	$ 6,743
Additional Liability, Long-Duration Insurance, Original Discount Rate, before Cash Flow and Reinsurance	7,784	7,175	6,731	6,203
Additional Liability, Long-Duration Insurance, Cumulative Increase (Decrease) from Cash Flow Change		52	(37)	153
Additional Liability, Long-Duration Insurance, Cumulative Increase (Decrease) of Actual Variance from Expected Experience		145	179	(124)
Additional Liability, Long-Duration Insurance, Original Discount Rate, before Reinsurance, after Cash Flow Change		7,372	6,873	$ 6,232
Additional Liability, Long-Duration Insurance, Interest Income (Expense)	357	333	308
Additional Liability, Long-Duration Insurance, Net Premium Collected	414	416	475
Additional Liability, Long-Duration Insurance, Benefit Payment	(359)	(447)	(286)
Additional Liability, Long-Duration Insurance, Remeasurement Gain (Loss)	0	0	2
AOCI, Liability for Future Policy Benefit, before Tax	(177)	(240)	437
Additional Liability, Long-Duration Insurance, Reinsurance Recoverable, after Allowance	1,438	1,384	1,294
Additional Liability, Long-Duration Insurance, after Reinsurance	$ 6,169	$ 5,551	$ 5,874
Additional Liability, Long-Duration Insurance, Weighted-Average Duration	6 years 8 months 12 days	6 years 8 months 12 days	6 years 8 months 12 days
Additional Liability, Long-Duration Insurance, Weighted-Average Interest Accretion Rate	4.92%	4.90%	4.90%
Additional Liability, Long-Duration Insurance, Gross Premium Income	$ 1,064	$ 1,070	$ 1,255