Finance Receivables, Net - Allowance for Credit Losses (Details) - USD ($) $ in Millions		3 Months Ended
		Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		$ 93	$ 93	$ 92	$ 107	$ 108	$ 108
Provision		8	8	9	6	9	9
Charge-offs		(9)	(11)	(8)	(8)	(8)	(10)
Recoveries and other	[1]	1	3	0	2	(2)	1
Ending Balance		93	93	93	107	107	108
Financing Receivable, Collectively Evaluated for Impairment	[2]							$ 3,381	$ 3,601	[3]
Allowance for doubtful accounts		93	93	92	107	108	108	93	107
United States
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		53	53	53	56	56	56
Provision		6	4	4	2	4	5
Charge-offs		(5)	(5)	(4)	(2)	(4)	(5)
Recoveries and other	[1]	1	1	0	1	0	0
Ending Balance		55	53	53	57	56	56
Financing Receivable, Collectively Evaluated for Impairment	[2]							1,900	1,960	[3]
Allowance for doubtful accounts		53	53	53	56	56	56	55	57
Canada
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		12	12	12	14	14	15
Provision		0	1	1	0	1	0
Charge-offs		(1)	(3)	(1)	(2)	(1)	(1)
Recoveries and other	[1]	0	2	0	1	0	0
Ending Balance		11	12	12	13	14	14
Financing Receivable, Collectively Evaluated for Impairment	[2]							318	352	[3]
Allowance for doubtful accounts		12	12	12	14	14	15	11	13
Europe
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		26	26	25	35	36	35
Provision		2	3	4	4	4	4
Charge-offs		(3)	(3)	(3)	(4)	(3)	(4)
Recoveries and other	[1]	0	0	0	0	(2)	1
Ending Balance		25	26	26	35	35	36
Financing Receivable, Collectively Evaluated for Impairment	[2]							1,120	1,242	[3]
Allowance for doubtful accounts		26	26	25	35	36	35	25	35
Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	[4]	2	2	2	2	2	2
Provision	[4]	0	0	0	0	0	0
Charge-offs	[4]	0	0	0	0	0	0
Recoveries and other	[1],[4]	0	0	0	0	0	0
Ending Balance	[4]	2	2	2	2	2	2
Financing Receivable, Collectively Evaluated for Impairment	[2],[4]							43	47	[3]
Allowance for doubtful accounts	[4]	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2

[1] Includes the impacts of foreign currency translation and adjustments to reserves necessary to reflect events of non-payment such as customer accommodations and contract terminations.

[2] Total Finance receivables exclude the allowance for credit losses of $93 and $107 at September 30, 2019 and 2018, respectively.

[3] As a result of an internal reorganization, XBS amounts, previously classified as Other, were reclassified to the U.S. in first quarter 2019. Prior year amounts have also been reclassified to conform to the current year presentation.

[4] Includes developing market countries and smaller units.