Cat Financial Financing Activities (Details-Allowance for credit losses) - Finance Receivables - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2020	Dec. 31, 2019
Allowance for Credit Loss Activity
Balance at beginning of year	$ 420	$ 507
Adjustment to adopt new accounting guidance	12
Receivables written off	(37)	(281)
Recoveries on receivables previously written off	7	44
Provision for credit losses	60	162
Other	(9)	(12)
Balance at end of period	453	420
Allowance for Credit Losses
Individually evaluated for impairment			$ 215	$ 217
Collectively evaluated for impairment			238	203
Ending Balance	453	507	453	420
Finance Receivables
Individually evaluated for impairment			648	672
Collectively evaluated for impairment			20,936	21,725
Total Finance Receivables			21,584	22,397
Customer
Allowance for Credit Loss Activity
Balance at beginning of year	375	486
Adjustment to adopt new accounting guidance	12
Receivables written off	(37)	(281)
Recoveries on receivables previously written off	7	44
Provision for credit losses	60	138
Other	(9)	(12)
Balance at end of period	408	375
Allowance for Credit Losses
Individually evaluated for impairment			176	178
Collectively evaluated for impairment			232	197
Ending Balance	375	375	408	375
Finance Receivables
Individually evaluated for impairment			570	594
Collectively evaluated for impairment			17,436	18,093
Total Finance Receivables			18,006	18,687
Dealer
Allowance for Credit Loss Activity
Balance at beginning of year	45	21
Adjustment to adopt new accounting guidance	0
Receivables written off	0	0
Recoveries on receivables previously written off	0	0
Provision for credit losses	0	24
Other	0	0
Balance at end of period	45	45
Allowance for Credit Losses
Individually evaluated for impairment			39	39
Collectively evaluated for impairment			6	6
Ending Balance	$ 45	$ 45	45	45
Finance Receivables
Individually evaluated for impairment			78	78
Collectively evaluated for impairment			3,500	3,632
Total Finance Receivables			$ 3,578	$ 3,710