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Financial Services Finance Receivables - Contractual Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Finance Receivables Maturity [Abstract]    
Finance Receivables Current $ 53,400  
Finance Receivables In Two Years 22,321  
Finance Receivables In Three Years 16,347  
Finance Receivables In Four Years And Thereafter 20,201  
Total Finance Receivable Before Unearned Interest Supplements 112,269  
Consumer [Member] | Retail financing [Member]    
Finance Receivables Maturity [Abstract]    
Finance Receivables Current 22,902  
Finance Receivables In Two Years 20,380  
Finance Receivables In Three Years 16,162  
Finance Receivables In Four Years And Thereafter 18,887  
Total Finance Receivable Before Unearned Interest Supplements 78,331 $ 68,121
Investments in Direct Financing Leases [Abstract]    
Estimated residual values 436  
Non-consumer [Member] | Dealer financing [Member]    
Finance Receivables Maturity [Abstract]    
Finance Receivables Current 30,498  
Finance Receivables In Two Years 1,941  
Finance Receivables In Three Years 185  
Finance Receivables In Four Years And Thereafter 1,314  
Total Finance Receivable Before Unearned Interest Supplements $ 33,938