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Guarantees and product warranty (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]    
Related liability $ 5 $ 8
Guarantor Obligations    
Guarantees, maximum potential amount of future payments 1,609 1,978
Special-Purpose Company's assets in Consolidated Statement of Financial Position 1,453 1,149
Special-Purpose Company's liabilities in Consolidated Statement of Financial Position 1,452 1,148
Unused commitments and lines of credit for dealers 11,154  
Unused commitments and lines of credit for customers 693  
Caterpillar dealer performance guarantees    
Guarantor Obligations    
Guarantees, maximum potential amount of future payments 1,150 1,244
Supplier consortium performance guarantee    
Guarantor Obligations    
Guarantees, maximum potential amount of future payments 238 527
Other guarantees    
Guarantor Obligations    
Guarantees, maximum potential amount of future payments $ 221 $ 207