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Finance Receivables (Details 6) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Finance Receivables (Details 6) - USD ($) $ in Millions	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Receivables [Abstract]
Period after which collection of future income is considered as not probable		120 days
Customer
Financing Receivable, Impaired
Recorded Investment With No Allowance Recorded				$ 94
Unpaid Principal Balance With No Allowance Recorded				94
Related Allowance With No Allowance Recorded				0
Recorded Investment With An Allowance Recorded				500
Unpaid Principal Balance With An Allowance Recorded				512
Related Allowance With An Allowance Recorded				178
Recorded Investment, Total				594
Unpaid Principal Balance, Total				606
Related Allowance, Total				178
Average Recorded Investment With No Allowance Recorded	$ 130		$ 121
Interest Income Recognized With No Allowance Recorded	1		4
Average Recorded Investment With An Allowance Recorded	632		677
Interest Income Recognized With An Allowance Recorded	5		18
Average Recorded Investment, Total	762		798
Interest Income Recognized, Total	6		22
Customer \| North America
Financing Receivable, Impaired
Recorded Investment With No Allowance Recorded				6
Unpaid Principal Balance With No Allowance Recorded				6
Related Allowance With No Allowance Recorded				0
Recorded Investment With An Allowance Recorded				30
Unpaid Principal Balance With An Allowance Recorded				30
Related Allowance With An Allowance Recorded				11
Recorded Investment, Total				36
Unpaid Principal Balance, Total				36
Related Allowance, Total				11
Average Recorded Investment With No Allowance Recorded	10		10
Interest Income Recognized With No Allowance Recorded	0		0
Average Recorded Investment With An Allowance Recorded	30		36
Interest Income Recognized With An Allowance Recorded	0		1
Average Recorded Investment, Total	40		46
Interest Income Recognized, Total	0		1
Customer \| EAME
Financing Receivable, Impaired
Recorded Investment With No Allowance Recorded				0
Unpaid Principal Balance With No Allowance Recorded				0
Related Allowance With No Allowance Recorded				0
Recorded Investment With An Allowance Recorded				61
Unpaid Principal Balance With An Allowance Recorded				61
Related Allowance With An Allowance Recorded				29
Recorded Investment, Total				61
Unpaid Principal Balance, Total				61
Related Allowance, Total				29
Average Recorded Investment With No Allowance Recorded	15		7
Interest Income Recognized With No Allowance Recorded	0		0
Average Recorded Investment With An Allowance Recorded	80		88
Interest Income Recognized With An Allowance Recorded	1		2
Average Recorded Investment, Total	95		95
Interest Income Recognized, Total	1		2
Customer \| Asia/Pacific
Financing Receivable, Impaired
Recorded Investment With No Allowance Recorded				0
Unpaid Principal Balance With No Allowance Recorded				0
Related Allowance With No Allowance Recorded				0
Recorded Investment With An Allowance Recorded				8
Unpaid Principal Balance With An Allowance Recorded				8
Related Allowance With An Allowance Recorded				2
Recorded Investment, Total				8
Unpaid Principal Balance, Total				8
Related Allowance, Total				2
Average Recorded Investment With No Allowance Recorded	0		0
Interest Income Recognized With No Allowance Recorded	0		0
Average Recorded Investment With An Allowance Recorded	12		9
Interest Income Recognized With An Allowance Recorded	1		1
Average Recorded Investment, Total	12		9
Interest Income Recognized, Total	1		1
Customer \| Mining
Financing Receivable, Impaired
Recorded Investment With No Allowance Recorded				22
Unpaid Principal Balance With No Allowance Recorded				22
Related Allowance With No Allowance Recorded				0
Recorded Investment With An Allowance Recorded				37
Unpaid Principal Balance With An Allowance Recorded				36
Related Allowance With An Allowance Recorded				9
Recorded Investment, Total				59
Unpaid Principal Balance, Total				58
Related Allowance, Total				9
Average Recorded Investment With No Allowance Recorded	26		29
Interest Income Recognized With No Allowance Recorded	0		1
Average Recorded Investment With An Allowance Recorded	65		49
Interest Income Recognized With An Allowance Recorded	1		2
Average Recorded Investment, Total	91		78
Interest Income Recognized, Total	1		3
Customer \| Latin America
Financing Receivable, Impaired
Recorded Investment With No Allowance Recorded				8
Unpaid Principal Balance With No Allowance Recorded				8
Related Allowance With No Allowance Recorded				0
Recorded Investment With An Allowance Recorded				58
Unpaid Principal Balance With An Allowance Recorded				58
Related Allowance With An Allowance Recorded				20
Recorded Investment, Total				66
Unpaid Principal Balance, Total				66
Related Allowance, Total				20
Average Recorded Investment With No Allowance Recorded	22		22
Interest Income Recognized With No Allowance Recorded	0		1
Average Recorded Investment With An Allowance Recorded	69		73
Interest Income Recognized With An Allowance Recorded	1		4
Average Recorded Investment, Total	91		95
Interest Income Recognized, Total	1		5
Customer \| Caterpillar Power Finance
Financing Receivable, Impaired
Recorded Investment With No Allowance Recorded				58
Unpaid Principal Balance With No Allowance Recorded				58
Related Allowance With No Allowance Recorded				0
Recorded Investment With An Allowance Recorded				306
Unpaid Principal Balance With An Allowance Recorded				319
Related Allowance With An Allowance Recorded				107
Recorded Investment, Total				364
Unpaid Principal Balance, Total				377
Related Allowance, Total				107
Average Recorded Investment With No Allowance Recorded	57		53
Interest Income Recognized With No Allowance Recorded	1		2
Average Recorded Investment With An Allowance Recorded	376		422
Interest Income Recognized With An Allowance Recorded	1		8
Average Recorded Investment, Total	433		475
Interest Income Recognized, Total	$ 2		$ 10
Dealer \| Latin America
Financing Receivable, Impaired
Related Allowance With An Allowance Recorded				39
Recorded Investment, Total				78
Related Allowance, Total				39
Caterpillar Purchased Receivables
Financing Receivable, Impaired
Recorded Investment, Total				$ 0