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Financing Receivables - Net of Allowances (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing receivables      
Financing receivables, net, current $ 18,050 $ 19,006  
Financing receivables, net, noncurrent 8,459 9,021  
Lease receivables      
Financing receivables      
Financing receivables, net, current 3,092 2,909  
Financing receivables, net, noncurrent 3,579 3,950  
Sales-type and direct financing leases, unguaranteed residual value 567 585  
Sales-type and direct financing leases, unearned income 459 513  
Allowance for credit losses $ 118 133 $ 213
Lease receivables | Minimum      
Financing receivables      
Financing receivable, payment terms 2 years    
Lease receivables | Maximum      
Financing receivables      
Financing receivable, payment terms 6 years    
Commercial financing receivables      
Financing receivables      
Financing receivables, net, current $ 8,563 9,706  
Allowance for credit losses $ 21 28  
Commercial financing receivables | Minimum      
Financing receivables      
Financing receivable, payment terms 30 days    
Commercial financing receivables | Maximum      
Financing receivables      
Financing receivable, payment terms 90 days    
Loan receivables      
Financing receivables      
Financing receivables, net, current $ 6,395 6,390  
Financing receivables, net, noncurrent 4,879 5,071  
Allowance for credit losses $ 215 $ 276 $ 377
Loan receivables | Maximum      
Financing receivables      
Financing receivable, payment terms 7 years