Variable Interest Entities - Assets and liabilities of consolidated VIEs (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Assets
Fixed income securities	$ 41,715	$ 42,136
Short-term investments	4,030	4,009
Deferred policy acquisition costs	5,273	4,722
Premium installment and other receivables, net	9,150	8,364
Reinsurance recoverables, net	9,961	10,024
Other assets	6,109	6,086
Total assets	97,676	99,440
Liabilities
Reserve for property and casualty insurance claims and claims expense	36,529	33,060
Unearned premiums	22,026	19,844
Total liabilities	80,115	74,313
Variable Interest Entity, Primary Beneficiary
Assets
Fixed income securities	302	324
Short-term investments	12	30
Deferred policy acquisition costs	20	15
Premium installment and other receivables, net	41	42
Reinsurance recoverables, net	119	114
Other assets	89	82
Total assets	583	607
Liabilities
Reserve for property and casualty insurance claims and claims expense	200	226
Unearned premiums	174	175
Other liabilities and expenses	327	265
Total liabilities	$ 701	$ 666