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Receivables (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Finance and Financial Products [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and finance receivables before allowances and discounts $ 13,983 $ 13,728
Allowances for uncollectible loans (180) (182)
Unamortized acquisition discounts (210) (246)
Total loans and finance receivables of finance and financial products businesses 13,593 13,300
Insurance and Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Insurance premiums receivable 11,317 10,462
Reinsurance recoverable on unpaid losses 3,254 3,338
Trade and other receivables 15,443 13,630
Allowances for uncollectible accounts (362) (333)
Total receivables of insurance and other businesses $ 29,652 $ 27,097