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Receivables (Detail) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Insurance and Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Insurance premiums receivable $ 9,001 $ 7,914
Reinsurance recoverable on unpaid losses 3,321 3,116
Trade and other receivables 12,607 11,133
Allowances for uncollectible accounts (323) (311)
Total receivables of insurance and other businesses 24,606 21,852
Finance and Financial Products [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and finance receivables before allowances and discounts 13,040 13,150
Allowances for uncollectible loans (195) (303)
Unamortized acquisition discounts (253) (281)
Total loans and finance receivables of finance and financial products businesses $ 12,592 $ 12,566