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Financing Receivables - Components of Financing Receivables (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Components of the company's financing receivables      
Financing receivables, gross $ 29,444 $ 32,348  
Unearned income (1,148) (1,195)  
Recorded Investment 28,296 31,153  
Allowance for credit losses (287) (292)  
Unguaranteed residual value 566 589  
Guaranteed residual value 72 85  
Total financing receivables, net 28,648 31,536  
Current portion 20,287 22,388  
Noncurrent portion 8,361 9,148  
Financing receivables pledged as collateral for borrowings 868 710  
Financing receivables held for sale 0 0  
Lease receivables      
Components of the company's financing receivables      
Financing receivables, gross 6,477 6,846  
Unearned income (497) (526)  
Recorded Investment 5,980 6,320  
Allowance for credit losses (95) (99) $ (103)
Unguaranteed residual value 566 589  
Guaranteed residual value 72 85  
Total financing receivables, net 6,523 6,895  
Current portion 2,712 2,834  
Noncurrent portion 3,811 4,061  
Commercial Financing Receivables      
Components of the company's financing receivables      
Financing receivables, gross 10,385 11,889  
Unearned income (34) (37)  
Recorded Investment 10,351 11,852  
Allowance for credit losses (18) (13)  
Total financing receivables, net 10,333 11,838  
Current portion 10,333 11,838  
Loan receivables      
Components of the company's financing receivables      
Financing receivables, gross 12,582 13,614  
Unearned income (617) (632)  
Recorded Investment 11,965 12,981  
Allowance for credit losses (174) (179) $ (211)
Total financing receivables, net 11,791 12,802  
Current portion 7,241 7,716  
Noncurrent portion $ 4,550 $ 5,086