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Other receivables (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Reinsurance recoverable on unpaid losses $ 3,149 $ 3,060 $ 2,989 $ 3,201
Insurance and Other [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Insurance premiums receivable 13,762 12,452    
Reinsurance recoverable on unpaid losses 3,149 3,060    
Trade receivables 13,180 12,617    
Other 4,224 3,823    
Allowances for uncollectible accounts (374) (388)    
Other receivables 33,941 31,564    
Railroad, Utilities and Energy [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Trade receivables 3,448 3,433    
Other 320 362    
Allowances for uncollectible accounts (127) (129)    
Receivables $ 3,641 $ 3,666