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Reinsurance - Summary of Amounts Receivable from Reinsurers (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Reinsurance receivables related to insurance reserves:    
Ceded claim and claim adjustment expenses $ 3,934 $ 4,094
Ceded future policy benefits 230 212
Reinsurance receivables related to paid losses 126 147
Reinsurance receivables 4,290 4,453
Less allowance for doubtful accounts 29 37
Reinsurance receivables, net of allowance for doubtful accounts $ 4,261 $ 4,416