Insurance Liabilities - Schedule of liabilities by product (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 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	$ 55,690	$ 53,844	$ 51,914		$ 67,364
Effect of changes in cash flow assumptions			0	$ 0
Effect of actual variances from expected experience			(10)	(4)
Adjusted beginning of year balance			16,764	14,783
Issuances	733	728
Interest accrual	258	224
Other	10	0
Less: Reinsurance recoverable:	(23,765)	(26,677)
Net liability for future policy benefits after reinsurance recoverable	31,925	27,167
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	3,458	3,663	3,355	5,007		$ 5,172
Effect of actual variances from expected experience			148	192
Adjusted beginning of year balance			3,503	5,199
Assessments	342	345
Excess benefits paid	(457)	(496)
Interest accrual	62	66
Other	(3)	(5)
Changes related to unrealized appreciation (depreciation) of investments	11	(1,446)
Less: Reinsurance recoverable:	(172)	(209)
Net liability for future policy benefits after reinsurance recoverable	3,286	3,454
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			10	(8)
Adjusted beginning of year balance			13,536	13,655
Issuances	666	728
Interest accrual	214	199
Other	$ 10	$ 0
Weighted average liability duration of the liability for future policy benefits (in years)	12 years 6 months	12 years 8 months 12 days
Life Insurance | Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits for life and accident and health insurance contracts	$ 3,402	$ 3,608	3,300	4,952		5,117
Effect of actual variances from expected experience			149	194
Adjusted beginning of year balance			3,449	5,146
Assessments	341	344
Excess benefits paid	(457)	(496)
Interest accrual	61	65
Other	(3)	(5)
Changes related to unrealized appreciation (depreciation) of investments	11	(1,446)
Less: Reinsurance recoverable:	(172)	(209)
Net liability for future policy benefits after reinsurance recoverable	$ 3,230	$ 3,399
Weighted average liability duration of the liability for future policy benefits (in years)	26 years 2 months 12 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			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 9 months 18 days	7 years 8 months 12 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)	6 years 10 months 24 days	7 years 2 months 12 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			6	4
Adjusted beginning of year balance			1,063	1,128
Issuances	$ 0	$ 0
Interest accrual	23	25
Other	$ 0	$ 0
Weighted average liability duration of the liability for future policy benefits (in years)	11 years 6 months	12 years
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	$ 56	$ 55	55	55		55
Effect of actual variances from expected experience			(1)	(2)
Adjusted beginning of year balance			$ 54	$ 53
Assessments	1	1
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	$ 56	$ 55
Weighted average liability duration of the liability for future policy benefits (in years)	9 years 2 months 12 days	9 years 8 months 12 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