Variable Interest Entities - Assets and liabilities of consolidated VIEs (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Assets
Fixed income securities, at fair value	$ 41,282	$ 42,136
Short-term investments	4,384	4,009
Deferred policy acquisition costs	5,030	4,722
Premium installment and other receivables, net	8,824	8,364
Reinsurance recoverables, net	9,376	10,024
Other assets	6,351	6,086
Total assets	96,350	99,440
Liabilities
Reserve for property and casualty insurance claims and claims expense	34,276	33,060
Unearned premiums	21,026	19,844
Total liabilities	76,326	74,313
Variable Interest Entity, Primary Beneficiary
Assets
Fixed income securities, at fair value	327	324
Short-term investments	20	30
Deferred policy acquisition costs	14	15
Premium installment and other receivables, net	39	42
Reinsurance recoverables, net	93	114
Other assets	56	82
Total assets	549	607
Liabilities
Reserve for property and casualty insurance claims and claims expense	204	226
Unearned premiums	169	175
Other liabilities and expenses	273	265
Total liabilities	$ 646	$ 666