Insurance Liabilities - Schedule of Liabilities by Product (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Movement in Liability for Future Policy Benefits [Roll Forward]
Liability for future policy benefits, balance, beginning of year	$ 58,576
Effect of changes in experience			$ (15)	$ 6
Adjusted beginning balance			17,191	16,780
Interest accrual	139	$ 129
Other	(4)	3
Liability for future policy benefits, balance end of period	58,985	54,846
Less: Reinsurance recoverable	(22,898)	(24,266)
Liability for future policy benefits, end of period, net of Reinsurance recoverable	36,087	30,580
Universal Life
Movement in Liability for Future Policy Benefits [Roll Forward]
Liability for future policy benefits, balance, beginning of year	3,786	3,355
Effect of changes in experience			108	73
Adjusted beginning balance			3,894	3,428
Assessments	145	179
Excess benefits paid	(232)	(238)
Interest accrual	39	29
Other	0	(5)
Changes related to unrealized appreciation (depreciation) of investments	126	119
Liability for future policy benefits, balance end of period	3,972	3,512
Less: Reinsurance recoverable	(227)	(192)
Liability for future policy benefits, end of period, net of Reinsurance recoverable	3,745	3,320
Universal Life | Other Operations before consolidation and eliminations
Movement in Liability for Future Policy Benefits [Roll Forward]
Liability for future policy benefits, balance, beginning of year	55	55
Effect of changes in experience			(1)	(1)
Adjusted beginning balance			54	54
Assessments	0	0
Excess benefits paid	0	0
Interest accrual	1	1
Other	0	0
Changes related to unrealized appreciation (depreciation) of investments	0	0
Liability for future policy benefits, balance end of period	55	55
Less: Reinsurance recoverable	(55)	0
Liability for future policy benefits, end of period, net of Reinsurance recoverable	$ 0	$ 55
Weighted average liability duration of the liability for future policy benefits (in years)	9 years 1 month 6 days	9 years 4 months 24 days
Life and Retirement | Universal Life | Life Insurance | Reportable Segments
Movement in Liability for Future Policy Benefits [Roll Forward]
Liability for future policy benefits, balance, beginning of year	$ 3,731	$ 3,300
Effect of changes in experience			109	74
Adjusted beginning balance			$ 3,840	$ 3,374
Assessments	145	179
Excess benefits paid	(232)	(238)
Interest accrual	38	28
Other	0	(5)
Changes related to unrealized appreciation (depreciation) of investments	126	119
Liability for future policy benefits, balance end of period	3,917	3,457
Less: Reinsurance recoverable	(172)	(192)
Liability for future policy benefits, end of period, net of Reinsurance recoverable	$ 3,745	$ 3,265
Weighted average liability duration of the liability for future policy benefits (in years)	25 years 3 months 18 days	26 years 4 months 24 days