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Finance Receivables - Credit Quality (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Credit quality [Line Items]      
Uncollected Interest Receivable Excluded From Finance Receivable $ 213 $ 209  
Financing Receivable By Credit Quality Indicator 95,736 91,064 $ 83,156
Consumer [Member]      
Credit quality [Line Items]      
Financing Receivable By Credit Quality Indicator $ 62,185 59,949 55,907
Consumer [Member] | Minimum [Member] | Special Mention [Member]      
Credit quality [Line Items]      
Finance Receivables Credit Quality Ratings Term Range 61 days    
Consumer [Member] | Minimum [Member] | Substandard [Member]      
Credit quality [Line Items]      
Finance Receivables Credit Quality Ratings Term Range 120 days    
Consumer [Member] | Maximum [Member] | Pass [Member]      
Credit quality [Line Items]      
Finance Receivables Credit Quality Ratings Term Range 60 days    
Consumer [Member] | Maximum [Member] | Special Mention [Member]      
Credit quality [Line Items]      
Finance Receivables Credit Quality Ratings Term Range 120 days    
Non-consumer [Member]      
Credit quality [Line Items]      
Financing Receivable By Credit Quality Indicator $ 33,551 31,115 $ 27,249
Non-consumer [Member] | Dealer financing [Member]      
Credit quality [Line Items]      
Financing Receivable By Credit Quality Indicator 33,551 31,115  
Non-consumer [Member] | Dealer financing [Member] | Group I      
Credit quality [Line Items]      
Financing Receivable By Credit Quality Indicator 24,853 22,146  
Non-consumer [Member] | Dealer financing [Member] | Group II      
Credit quality [Line Items]      
Financing Receivable By Credit Quality Indicator 6,849 7,175  
Non-consumer [Member] | Dealer financing [Member] | Group III      
Credit quality [Line Items]      
Financing Receivable By Credit Quality Indicator 1,739 1,683  
Non-consumer [Member] | Dealer financing [Member] | Group IV      
Credit quality [Line Items]      
Financing Receivable By Credit Quality Indicator $ 110 $ 111