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Finance Receivables - Credit Quality and Impaired Receivables (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivables $ 108,822 $ 103,465 $ 101,785
Consumer Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivables $ 68,287 65,338 62,185
Number of Days Past Due After Which Consumer Receivables are Considered Impaired 120 days    
Impaired Financing Receivable, Recorded Investment $ 381 $ 367  
Impaired Financing Receivable Recorded Investment, Percentage of Receivable 0.60% 0.60%  
Consumer Portfolio Segment [Member] | Pass [Member] | Maximum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance Receivables Credit Quality Ratings Term Range 60 days    
Consumer Portfolio 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 Portfolio 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 Portfolio Segment [Member] | Substandard [Member] | Minimum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Finance Receivables Credit Quality Ratings Term Range 120 days    
Commercial Portfolio Segment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivables $ 40,535 $ 38,127 $ 39,600
Impaired Financing Receivable, Recorded Investment $ 181 $ 107  
Impaired Financing Receivable Recorded Investment, Percentage of Receivable 0.40% 0.30%  
Commercial Portfolio Segment [Member] | Wholesale and Dealer Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivables $ 38,750 $ 36,951  
Commercial Portfolio Segment [Member] | Wholesale and Dealer Loans [Member] | Group I      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivables 31,626 29,926  
Commercial Portfolio Segment [Member] | Wholesale and Dealer Loans [Member] | Group II      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivables 5,589 5,552  
Commercial Portfolio Segment [Member] | Wholesale and Dealer Loans [Member] | Group III      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivables 1,368 1,380  
Commercial Portfolio Segment [Member] | Wholesale and Dealer Loans [Member] | Group IV      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivables $ 167 $ 93