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Reinsurance - Summary of Amounts Receivable from Reinsurers (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Reinsurance receivables related to insurance reserves:    
Ceded claim and claim adjustment expenses $ 4,019 $ 3,934
Ceded future policy benefits 233 230
Reinsurance receivables related to paid losses 203 126
Reinsurance receivables 4,455 4,290
Less allowance for doubtful accounts 29 29
Reinsurance receivables, net of allowance for doubtful accounts $ 4,426 $ 4,261