RECEIVABLES - Allowance for Credit Losses Activity (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Retail
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Opening balance	$ 314	$ 317	$ 299	$ 326	$ 326
Provision	34	15	54	23	44
Charge-offs, net of recoveries	(24)	(16)	(44)	(27)	(51)
Foreign currency translation and other	2	3	(18)	(3)	(20)
Ending balance	326	319	326	319	299
Retail \| Adoption of ASC 326
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Opening balance			35
Ending balance					35
Retail \| Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Opening balance			334
Ending balance					334
Wholesale
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Opening balance	144	157	159	164	164
Provision	15	4	17	1	12
Charge-offs, net of recoveries	(1)	(4)	(1)	(6)	(18)
Foreign currency translation and other	1	1	(7)	(1)	1
Ending balance	$ 159	$ 158	159	$ 158	159
Wholesale \| Adoption of ASC 326
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Opening balance			(9)
Ending balance					(9)
Wholesale \| Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Opening balance			$ 150
Ending balance					$ 150

Amount of gain (loss) from converting allowance reserve for credit loss to currency of reporting entity from amount denominated or measured in a different currency, which decreases (increases) the allowance for loan and lease losses.

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- Definition

Amount, after recoveries, of loans and leases that have been written-off.

+ References

No definition available.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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- Definition

Amount of expense related to estimated loss from loan and lease transactions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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