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Financing Receivables - Components of Financing Receivables (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Components of the company's financing receivables      
Financing receivables, gross $ 28,222 $ 32,087  
Unearned income (1,108) (1,210)  
Recorded Investment 27,114 30,877  
Allowance for credit losses (325) (336)  
Unguaranteed residual value 549 630  
Guaranteed residual value 90 100  
Total financing receivables, net 27,427 31,272  
Current portion 19,249 21,721  
Noncurrent portion 8,179 9,550  
Financing receivables pledged as collateral for borrowings 754 773  
Financing receivables held for sale 0 0  
Lease receivables      
Components of the company's financing receivables      
Financing receivables, gross 6,566 7,128  
Unearned income (502) (535)  
Recorded Investment 6,064 6,593  
Allowance for credit losses (103) (103) $ (133)
Unguaranteed residual value 549 630  
Guaranteed residual value 90 100  
Total financing receivables, net 6,599 7,220  
Current portion 2,764 2,900  
Noncurrent portion 3,836 4,320  
Commercial financing receivables      
Components of the company's financing receivables      
Financing receivables, gross 9,397 11,649  
Unearned income (30) (32)  
Recorded Investment 9,367 11,617  
Allowance for credit losses (12) (21)  
Total financing receivables, net 9,355 11,596  
Current portion 9,355 11,596  
Loan receivables      
Components of the company's financing receivables      
Financing receivables, gross 12,259 13,311  
Unearned income (576) (644)  
Recorded Investment 11,683 12,667  
Allowance for credit losses (210) (211) $ (276)
Total financing receivables, net 11,473 12,456  
Current portion 7,130 7,226  
Noncurrent portion $ 4,343 $ 5,230