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Finance Receivables (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable      
Finance leases and installment sale contracts - Retail $ 15,544 $ 14,647  
Retail notes receivable 8,382 9,417  
Wholesale notes receivable 4,781 4,161  
Finance leases and installment sale contracts - Wholesale 147 119  
Total gross finance receivables 28,854 28,344  
Less: Unearned income (926) (853)  
Recorded Investment in Finance Receivables 27,928 27,491  
Less: Allowance for credit losses (416) (365) $ (343)
Total finance receivables, net $ 27,512 $ 27,126