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Financial Services Finance Receivables - Credit Quality (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Credit quality [Line Items]      
Financing Receivable By Credit Quality Indicator $ 108,292 $ 108,989 $ 101,961
Consumer [Member]      
Credit quality [Line Items]      
Financing Receivable By Credit Quality Indicator 75,581 75,051 68,153
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing $ 27 24  
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 $ 32,711 33,938 $ 33,808
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0 1  
Non-consumer [Member] | Dealer financing [Member]      
Credit quality [Line Items]      
Financing Receivable By Credit Quality Indicator 32,711 33,938  
Non-consumer [Member] | Dealer financing [Member] | Group I      
Credit quality [Line Items]      
Financing Receivable By Credit Quality Indicator 25,441 26,252  
Non-consumer [Member] | Dealer financing [Member] | Group II      
Credit quality [Line Items]      
Financing Receivable By Credit Quality Indicator 5,695 5,908  
Non-consumer [Member] | Dealer financing [Member] | Group III      
Credit quality [Line Items]      
Financing Receivable By Credit Quality Indicator 1,479 1,640  
Non-consumer [Member] | Dealer financing [Member] | Group IV      
Credit quality [Line Items]      
Financing Receivable By Credit Quality Indicator $ 96 $ 138