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Receivables (Detail) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Reinsurance recoverable on unpaid losses $ 3,048 $ 3,201 $ 3,221 $ 3,338
Finance and Financial Products [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and finance receivables before allowances and discounts 14,209 14,126    
Allowances for uncollectible loans (179) (180)    
Unamortized acquisition discounts (185) (198)    
Total loans and finance receivables of finance and financial products businesses 13,845 13,748    
Insurance and Other [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Insurance premiums receivable 12,570 11,058    
Reinsurance recoverable on unpaid losses 3,048 3,201    
Trade receivables 12,568 11,756    
Other 3,078 2,925    
Allowances for uncollectible accounts (358) (362)    
Total receivables of insurance and other businesses $ 30,906 $ 28,578