Insurance Liabilities - Schedule of liabilities by product (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	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	$ 54,846	$ 59,307	$ 51,914		$ 67,364
Effect of changes in cash flow assumptions			0	$ 0
Effect of actual variances from expected experience			6	31
Adjusted beginning of year balance			16,780	14,818
Issuances	364	379
Interest accrual	129	113
Other	3	0
Less: Reinsurance recoverable:	(24,266)	(29,342)
Net liability for future policy benefits after reinsurance recoverable	30,580	29,965
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	3,512	4,223	3,355	5,007		$ 5,172
Effect of actual variances from expected experience			73	107
Adjusted beginning of year balance			3,428	5,114
Assessments	179	168
Excess benefits paid	(238)	(290)
Interest accrual	29	35
Other	(5)	(7)
Changes related to unrealized appreciation (depreciation) of investments	119	(797)
Less: Reinsurance recoverable:	(192)	(198)
Net liability for future policy benefits after reinsurance recoverable	3,320	4,025
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
Liability for Future Policy Benefit, Activity [Line Items]
Effect of changes in cash flow assumptions			0	0
Effect of actual variances from expected experience			12	29
Adjusted beginning of year balance			13,538	13,692
Issuances	322	375
Interest accrual	106	100
Other	$ 3	$ 0
Weighted average liability duration of the liability for future policy benefits (in years)	12 years 4 months 24 days	13 years 7 months 6 days
Life Insurance | Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts	$ 3,457	$ 4,168	3,300	4,952		5,117
Effect of actual variances from expected experience			74	108
Adjusted beginning of year balance			3,374	5,060
Assessments	179	168
Excess benefits paid	(238)	(290)
Interest accrual	28	34
Other	(5)	(7)
Changes related to unrealized appreciation (depreciation) of investments	119	(797)
Less: Reinsurance recoverable:	(192)	(198)
Net liability for future policy benefits after reinsurance recoverable	$ 3,265	$ 3,970
Weighted average liability duration of the liability for future policy benefits (in years)	26 years 4 months 24 days	27 years 1 month 6 days
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
Liability for Future Policy Benefit, Activity [Line Items]
Effect of changes in cash flow assumptions			0	0
Effect of actual variances from expected experience			1	0
Adjusted beginning of year balance			1	0
Issuances	$ 6	$ 4
Interest accrual	0	0
Other	$ 0	$ 0
Weighted average liability duration of the liability for future policy benefits (in years)	7 years 8 months 12 days	8 years 1 month 6 days
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
Liability for Future Policy Benefit, Activity [Line Items]
Effect of changes in cash flow assumptions			0	0
Effect of actual variances from expected experience			0	0
Adjusted beginning of year balance			0	0
Issuances	$ 0	$ 0
Interest accrual	0	0
Other	$ 0	$ 0
Weighted average liability duration of the liability for future policy benefits (in years)	7 years 1 month 6 days	7 years 4 months 24 days
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
Other Operations before consolidation and eliminations
Liability for Future Policy Benefit, Activity [Line Items]
Effect of changes in cash flow assumptions			0	0
Effect of actual variances from expected experience			3	2
Adjusted beginning of year balance			1,060	1,126
Issuances	$ 0	$ 0
Interest accrual	12	13
Other	$ 0	$ 0
Weighted average liability duration of the liability for future policy benefits (in years)	11 years 7 months 6 days	12 years 9 months 18 days
Other Operations before consolidation and eliminations | Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts	$ 55	$ 55	55	55		55
Effect of actual variances from expected experience			(1)	(1)
Adjusted beginning of year 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
Less: Reinsurance recoverable:	0	0
Net liability for future policy benefits after reinsurance recoverable	$ 55	$ 55
Weighted average liability duration of the liability for future policy benefits (in years)	9 years 4 months 24 days	9 years 9 months 18 days
Other Operations before consolidation and eliminations | 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
Other Operations before consolidation and eliminations | 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
Other Operations before consolidation and eliminations | 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