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Reinsurance - Summary of Amounts Receivable from Reinsurers (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Reinsurance Disclosures [Abstract]    
Ceded claim and claim adjustment expenses $ 3,835 $ 4,019
Ceded future policy benefits 226 233
Reinsurance receivables related to paid losses 143 203
Reinsurance receivables 4,204 4,455
Less allowance for doubtful accounts 25 29
Reinsurance receivables, net of allowance for doubtful accounts $ 4,179 $ 4,426