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Financing Receivables - Components of Financing Receivables (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Components of the company's financing receivables      
Financing receivables, gross $ 29,420 $ 32,087  
Unearned income (1,158) (1,210)  
Recorded Investment 28,262 30,877  
Allowance for credit losses (339) (336)  
Unguaranteed residual value 575 630  
Guaranteed residual value 91 100  
Total financing receivables, net 28,589 31,272  
Current portion 19,806 21,721  
Noncurrent portion 8,783 9,550  
Financing receivables pledged as collateral for borrowings 743 773  
Financing receivables held for sale 0 0  
Lease receivables      
Components of the company's financing receivables      
Financing receivables, gross 6,834 7,128  
Unearned income (523) (535)  
Recorded Investment 6,312 6,593  
Allowance for credit losses (110) (103) $ (133)
Unguaranteed residual value 575 630  
Guaranteed residual value 91 100  
Total financing receivables, net 6,867 7,220  
Current portion 2,866 2,900  
Noncurrent portion 4,001 4,320  
Commercial financing receivables      
Components of the company's financing receivables      
Financing receivables, gross 9,711 11,649  
Unearned income (30) (32)  
Recorded Investment 9,681 11,617  
Allowance for credit losses (14) (21)  
Total financing receivables, net 9,667 11,596  
Current portion 9,667 11,596  
Loan receivables      
Components of the company's financing receivables      
Financing receivables, gross 12,874 13,311  
Unearned income (605) (644)  
Recorded Investment 12,269 12,667  
Allowance for credit losses (215) (211) $ (276)
Total financing receivables, net 12,055 12,456  
Current portion 7,273 7,226  
Noncurrent portion $ 4,781 $ 5,230