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Reinsurance - Summary of Amounts Receivable from Reinsurers (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Reinsurance receivables related to insurance reserves:    
Ceded claim and claim adjustment expenses $ 4,094 $ 4,087
Ceded future policy benefits 212 207
Reinsurance receivables related to paid losses 147 197
Reinsurance receivables 4,453 4,491
Less allowance for doubtful accounts 37 38
Reinsurance receivables, net of allowance for doubtful accounts $ 4,416 $ 4,453