Insurance Liabilities - Schedule of liabilities by product (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2021	Dec. 31, 2020
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts	$ 58,576	$ 51,914		$ 67,364
Effect of changes in cash flow assumptions		53
Effect of actual variances from expected experience		66
Adjusted beginning of year balance		16,893
Issuances	1,399
Interest accrual	526
Other	2
Less: Reinsurance recoverable:	(23,571)
Net liability for future policy benefits after reinsurance recoverable	35,005
As Previously Reported
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts		59,223		$ 56,878
Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts	3,786	3,355	$ 5,007		$ 5,172
Effect of changes in cash flow assumptions		(41)	(24)		(116)
Effect of actual variances from expected experience		315	299		327
Adjusted beginning of year balance		3,629	5,282		5,383
Assessments	673	689	671
Excess benefits paid	(943)	(909)	(859)
Interest accrual	134	128	138
Other	(9)	(11)	24
Changes related to unrealized appreciation (depreciation) of investments	302	(1,824)	(350)
Less: Reinsurance recoverable:	(164)	(191)	(200)
Net liability for future policy benefits after reinsurance recoverable	3,622	3,164	4,807
Universal Life | Other Operations before consolidation and eliminations
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts	55	55	55		55
Effect of actual variances from expected experience		(4)	(4)		(4)
Adjusted beginning of year balance		51	51		51
Assessments	2	2	2
Excess benefits paid	0	0	0
Interest accrual	2	2	2
Other	0	0	0
Changes related to unrealized appreciation (depreciation) of investments	0	0	0
Less: Reinsurance recoverable:	0	0	0
Net liability for future policy benefits after reinsurance recoverable	$ 55	$ 55	$ 55
Weighted average liability duration of the liability for future policy benefits (in years)	9 years 2 months 12 days	9 years 6 months	9 years 9 months 18 days
Universal Life | As Previously Reported
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts					6,816
Universal Life | Effect Of Application Of Accounting Standards Update 2018-12, Adjustments To Market Risk Benefits
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts					(1,039)
Universal Life | Effect Of Application Of Accounting Standards Update 2018-12, Adjustments To Reclass URGL Impacts To Market Risk Benefits
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts					(605)
Life Insurance | Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts					5,117
Life Insurance | Universal Life | As Previously Reported
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts					5,117
Life Insurance | Universal Life | Effect Of Application Of Accounting Standards Update 2018-12, Adjustments To Market Risk Benefits
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts					0
Life Insurance | Universal Life | Effect Of Application Of Accounting Standards Update 2018-12, Adjustments To Reclass URGL Impacts To Market Risk Benefits
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts					0
Individual Retirement | Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts					0
Individual Retirement | Universal Life | As Previously Reported
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts					1,423
Individual Retirement | Universal Life | Effect Of Application Of Accounting Standards Update 2018-12, Adjustments To Market Risk Benefits
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts					(907)
Individual Retirement | Universal Life | Effect Of Application Of Accounting Standards Update 2018-12, Adjustments To Reclass URGL Impacts To Market Risk Benefits
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts					(516)
Group Retirement | Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts					0
Group Retirement | Universal Life | As Previously Reported
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts					221
Group Retirement | Universal Life | Effect Of Application Of Accounting Standards Update 2018-12, Adjustments To Market Risk Benefits
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts					(132)
Group Retirement | Universal Life | Effect Of Application Of Accounting Standards Update 2018-12, Adjustments To Reclass URGL Impacts To Market Risk Benefits
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts					(89)
Institutional Markets | Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts					0
Institutional Markets | Universal Life | As Previously Reported
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts					0
Institutional Markets | Universal Life | Effect Of Application Of Accounting Standards Update 2018-12, Adjustments To Market Risk Benefits
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts					0
Institutional Markets | Universal Life | Effect Of Application Of Accounting Standards Update 2018-12, Adjustments To Reclass URGL Impacts To Market Risk Benefits
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts					0
Corporate and Other [Member] | Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts					55
Corporate and Other [Member] | Universal Life | As Previously Reported
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts					55
Corporate and Other [Member] | Universal Life | Effect Of Application Of Accounting Standards Update 2018-12, Adjustments To Market Risk Benefits
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts					0
Corporate and Other [Member] | Universal Life | Effect Of Application Of Accounting Standards Update 2018-12, Adjustments To Reclass URGL Impacts To Market Risk Benefits
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts					0
Life and Retirement
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts		$ 51,914	$ 66,399
Effect of changes in cash flow assumptions			123		92
Effect of actual variances from expected experience			(72)		385
Adjusted beginning of year balance			14,838		14,153
Issuances		1,358	1,727
Interest accrual		445	446
Other		0	0
Less: Reinsurance recoverable:		(24,078)	(32,586)
Net liability for future policy benefits after reinsurance recoverable		27,836	33,813
Life and Retirement | Universal Life | Life Insurance | Reportable Segments
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts	$ 3,731	3,300	4,952		5,117
Effect of changes in cash flow assumptions		(41)	(24)		(116)
Effect of actual variances from expected experience		319	303		331
Adjusted beginning of year balance		3,578	5,231		$ 5,332
Assessments	671	687	669
Excess benefits paid	(943)	(909)	(859)
Interest accrual	132	126	136
Other	(9)	(11)	24
Changes related to unrealized appreciation (depreciation) of investments	302	(1,824)	(350)
Less: Reinsurance recoverable:	(164)	(191)	(200)
Net liability for future policy benefits after reinsurance recoverable	$ 3,567	$ 3,109	$ 4,752
Weighted average liability duration of the liability for future policy benefits (in years)	25 years 4 months 24 days	26 years 3 months 18 days	27 years 1 month 6 days