Commitments and Contingent Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Guarantor Obligations
Guarantees, maximum potential amount of future payments	$ 36	$ 40
Assets	32,387	31,991	$ 33,693
Liabilities	29,406	28,500
Unused commitments to extend credit to Caterpillar dealers	10,760
Unused commitments to extend credit to customers	641
Variable Interest Entity, Primary Beneficiary
Guarantor Obligations
Assets	888	1,030
Liabilities	888	1,030
Maximum
Guarantor Obligations
Related recorded liability	$ 1	$ 1