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Finance Receivables (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable      
Recorded Investment in Finance Receivables $ 28,319 $ 28,434  
Less: Allowance for credit losses (534) (511) $ (365)
Total finance receivables, net 27,785 27,923  
Retail loans      
Accounts, Notes, Loans and Financing Receivable      
Recorded Investment in Finance Receivables 15,207 15,509  
Retail leases      
Accounts, Notes, Loans and Financing Receivable      
Recorded Investment in Finance Receivables 7,483 7,499  
Caterpillar Purchased Receivables      
Accounts, Notes, Loans and Financing Receivable      
Recorded Investment in Finance Receivables 4,814 4,691  
Wholesale loans      
Accounts, Notes, Loans and Financing Receivable      
Recorded Investment in Finance Receivables 714 626  
Wholesale leases      
Accounts, Notes, Loans and Financing Receivable      
Recorded Investment in Finance Receivables 101 109  
Caterpillar | Retail leases      
Accounts, Notes, Loans and Financing Receivable      
Recorded Investment in Finance Receivables $ 9 $ 9