Schedule III Supplementary Insurance Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Supplementary Insurance Information, by Segment [Line Items]
Deferred Policy Acquisition Costs	$ 10,514	$ 9,805
Liability for Unpaid Losses and Loss Adjustment Expenses, Future Policy Benefits	138,976	134,598
Unearned Premiums	19,313	18,660
Policy and Contract Claims	1,549	1,378
Premiums and Policy Fees	34,310	31,440	$ 33,576
Net Investment Income	14,612	13,631	14,619
Losses and Loss Expenses Incurred, Benefits	27,945	28,428	29,234
Amortization of Deferred Policy Acquisition Costs	4,573	4,211	5,164
Other Operating Expenses	8,790	8,396	8,537
Net Premiums Written	26,417	23,456	25,454
General Insurance
Supplementary Insurance Information, by Segment [Line Items]
Deferred Policy Acquisition Costs	2,428	2,489
Liability for Unpaid Losses and Loss Adjustment Expenses, Future Policy Benefits	75,500	74,315
Unearned Premiums	19,209	18,595
Policy and Contract Claims	0	0
Premiums and Policy Fees	25,057	23,662	26,438
Net Investment Income	3,304	2,925	3,444
Losses and Loss Expenses Incurred, Benefits	16,097	16,803	17,246
Amortization of Deferred Policy Acquisition Costs	3,530	3,538	4,482
Other Operating Expenses	4,375	4,345	4,621
Net Premiums Written	25,890	22,959	25,092
Life and Retirement
Supplementary Insurance Information, by Segment [Line Items]
Deferred Policy Acquisition Costs	8,086	7,316
Liability for Unpaid Losses and Loss Adjustment Expenses, Future Policy Benefits	57,749	54,645
Unearned Premiums	68	57
Policy and Contract Claims	1,460	1,336
Premiums and Policy Fees	9,080	7,498	6,712
Net Investment Income	9,521	8,881	8,733
Losses and Loss Expenses Incurred, Benefits	11,944	10,435	9,427
Amortization of Deferred Policy Acquisition Costs	973	632	672
Other Operating Expenses	2,636	2,522	2,542
Net Premiums Written	0	0	0
Other Operations
Supplementary Insurance Information, by Segment [Line Items]
Deferred Policy Acquisition Costs	0	0
Liability for Unpaid Losses and Loss Adjustment Expenses, Future Policy Benefits	5,727	5,638
Unearned Premiums	36	8
Policy and Contract Claims	89	42
Premiums and Policy Fees	173	280	426
Net Investment Income	1,787	1,825	2,442
Losses and Loss Expenses Incurred, Benefits	(96)	1,190	2,561
Amortization of Deferred Policy Acquisition Costs	70	41	10
Other Operating Expenses	1,779	1,529	1,374
Net Premiums Written	$ 527	$ 497	$ 362