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Receivables (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Reinsurance recoverable on unpaid losses $ 3,201 $ 3,338 $ 3,307 $ 3,116
Finance and Financial Products [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and finance receivables before allowances and discounts 14,126 13,728    
Allowances for uncollectible loans (180) (182)    
Unamortized acquisition discounts (198) (246)    
Total loans and finance receivables of finance and financial products businesses 13,748 13,300    
Insurance and Other [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Insurance premiums receivable 11,058 10,462    
Reinsurance recoverable on unpaid losses 3,201 3,338    
Trade and other receivables 14,681 13,630    
Allowances for uncollectible accounts (362) (333)    
Total receivables of insurance and other businesses $ 28,578 $ 27,097