Cat Financial Financing Activities (Details TDR) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) Contracts	Mar. 31, 2020 USD ($) Contracts
Customer
Finance receivables modified as TDRs
Pre-TDR Amortized Cost	$ 11	$ 2
Post-TDR Amortized Cost	5	2
TDRs which had been modified within twelve months of the default date
Post-TDR Amortized Cost	10	11
Customer | North America
TDRs which had been modified within twelve months of the default date
Post-TDR Amortized Cost	1	0
Customer | EAME
TDRs which had been modified within twelve months of the default date
Post-TDR Amortized Cost	0	10
Customer | Asia/Pacific
TDRs which had been modified within twelve months of the default date
Post-TDR Amortized Cost	4	0
Customer | Mining
Finance receivables modified as TDRs
Pre-TDR Amortized Cost	11	0
Post-TDR Amortized Cost	5	0
Customer | Latin America
Finance receivables modified as TDRs
Pre-TDR Amortized Cost	0	2
Post-TDR Amortized Cost	0	2
TDRs which had been modified within twelve months of the default date
Post-TDR Amortized Cost	0	1
Customer | Caterpillar Power Finance
TDRs which had been modified within twelve months of the default date
Post-TDR Amortized Cost	$ 5	$ 0
Dealer
Finance receivables modified as TDRs
Number of Contracts (in contracts) | Contracts	0	0