Schedule III (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]
Deferred Policy Acquisition Costs	$ 12,085	$ 12,857
Liability for Unpaid Losses and Loss Adjustment Expenses, Future Policy Benefits	128,969	127,081
Unearned Premiums	17,387	18,338
Policy and Contract Claims	1,006	1,456
Premiums and Policy Fees	36,051	34,769	$ 34,290
Net Investment Income	14,592	11,767	14,612
Losses and Loss Expenses Incurred, Benefits	29,179	25,920	27,355
Amortization of Deferred Policy Acquisition Costs	4,808	4,557	4,524
Other Operating Expenses	8,499	9,122	8,728
Net Premium Written	27,206	26,760	26,417
Corporate Reconciling Items And Eliminations
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]
Deferred Policy Acquisition Costs	0	0
Liability for Unpaid Losses and Loss Adjustment Expenses, Future Policy Benefits	5,056	5,067
Unearned Premiums	2	26
Policy and Contract Claims	(188)	147
Premiums and Policy Fees	62	1,010	173
Net Investment Income	1,784	1,038	1,787
Losses and Loss Expenses Incurred, Benefits	202	(288)	(101)
Amortization of Deferred Policy Acquisition Costs	124	3	36
Other Operating Expenses	1,746	2,339	1,780
Net Premium Written	487	1,248	527
General Insurance
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]
Deferred Policy Acquisition Costs	2,075	2,310
Liability for Unpaid Losses and Loss Adjustment Expenses, Future Policy Benefits	66,805	71,495
Unearned Premiums	17,374	18,253
Policy and Contract Claims	0	0
Premiums and Policy Fees	25,091	25,340	25,057
Net Investment Income	3,022	2,382	3,304
Losses and Loss Expenses Incurred, Benefits	14,775	15,407	16,097
Amortization of Deferred Policy Acquisition Costs	3,623	3,533	3,530
Other Operating Expenses	4,344	4,352	4,375
Net Premium Written	26,719	25,512	25,890
Life and Retirement
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]
Deferred Policy Acquisition Costs	10,010	10,547
Liability for Unpaid Losses and Loss Adjustment Expenses, Future Policy Benefits	57,108	50,519
Unearned Premiums	11	59
Policy and Contract Claims	1,194	1,309
Premiums and Policy Fees	10,898	8,419	9,060
Net Investment Income	9,786	8,347	9,521
Losses and Loss Expenses Incurred, Benefits	14,202	10,801	11,359
Amortization of Deferred Policy Acquisition Costs	1,061	1,021	958
Other Operating Expenses	2,409	2,431	2,573
Net Premium Written	$ 0	$ 0	$ 0