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Finance Receivables (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable      
Finance leases and installment sale contracts - Retail $ 14,855 $ 14,647  
Retail notes receivable 9,082 9,417  
Wholesale notes receivable 4,633 4,161  
Finance leases and installment sale contracts - Wholesale 120 119  
Total gross finance receivables 28,690 28,344  
Less: Unearned income (854) (853)  
Recorded Investment in Finance Receivables 27,836 27,491  
Less: Allowance for credit losses (403) (365) $ (343)
Total finance receivables, net 27,433 $ 27,126  
Finance receivables held-for-sale      
Accounts, Notes, Loans and Financing Receivable      
Retail notes receivable $ 221