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Finance Receivables - Credit Quality and Impaired Receivables (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivables $ 116,600 $ 103,465
Consumer Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Threshold Period for Impaired Finance Receivables 120 days  
Financing Receivables $ 75,187 65,338
Impaired Financing Receivable, Recorded Investment $ 386 $ 367
Impaired Financing Receivable Recorded Investment, Percentage of Receivable 0.50% 0.60%
Consumer Segment [Member] | Pass [Member] | Maximum [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Finance Receivables Credit Quality Ratings Term Range 60 days  
Consumer Segment [Member] | Special Mention [Member] | Minimum [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Finance Receivables Credit Quality Ratings Term Range 61 days  
Consumer Segment [Member] | Special Mention [Member] | Maximum [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Finance Receivables Credit Quality Ratings Term Range 120 days  
Consumer Segment [Member] | Substandard [Member] | Minimum [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Finance Receivables Credit Quality Ratings Term Range 120 days  
Non-Consumer Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivables $ 41,413 $ 38,127
Impaired Financing Receivable, Recorded Investment $ 138 $ 107
Impaired Financing Receivable Recorded Investment, Percentage of Receivable 0.30% 0.30%
Non-Consumer Segment [Member] | Wholesale and Dealer Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivables $ 39,241 $ 36,951
Non-Consumer Segment [Member] | Wholesale and Dealer Loans [Member] | Group I    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivables 31,551 29,926
Non-Consumer Segment [Member] | Wholesale and Dealer Loans [Member] | Group II    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivables 5,912 5,552
Non-Consumer Segment [Member] | Wholesale and Dealer Loans [Member] | Group III    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivables 1,640 1,380
Non-Consumer Segment [Member] | Wholesale and Dealer Loans [Member] | Group IV    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivables $ 138 $ 93