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Receivables (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Reinsurance recoverable on unpaid losses $ 2,944 $ 3,201 $ 3,254 $ 3,338
Insurance and Other [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Insurance premiums receivable 13,002 11,058    
Reinsurance recoverable on unpaid losses 2,944 3,201    
Trade receivables 13,197 11,756    
Other 3,121 2,925    
Allowances for uncollectible accounts (380) (362)    
Total receivables of insurance and other businesses 31,884 28,578    
Finance and Financial Products [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and finance receivables before allowances and discounts 14,832 14,126    
Allowances for uncollectible loans (183) (180)    
Unamortized acquisition discounts (172) (198)    
Total loans and finance receivables of finance and financial products businesses $ 14,477 $ 13,748