Finance Receivables, Allowance for Credit Losses (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance		$ 92	$ 108
Provision		9	9
Charge-offs		(8)	(10)
Recoveries and other	[1]	0	1
Ending Balance		93	108
Financing Receivable, Collectively Evaluated for Impairment	[2]			$ 3,466	$ 3,793	[3]
Financing Receivable, Allowance for Credit Losses		92	108	93	108
United States
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance		53	56
Provision		4	5
Charge-offs		(4)	(5)
Recoveries and other	[1]	0	0
Ending Balance		53	56
Financing Receivable, Collectively Evaluated for Impairment	[2]			1,895	2,006	[3]
Financing Receivable, Allowance for Credit Losses		53	56	53	56
Canada
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance		12	15
Provision		1	0
Charge-offs		(1)	(1)
Recoveries and other	[1]	0	0
Ending Balance		12	14
Financing Receivable, Collectively Evaluated for Impairment	[2]			329	373	[3]
Financing Receivable, Allowance for Credit Losses		12	15	12	14
Europe
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance		25	35
Provision		4	4
Charge-offs		(3)	(4)
Recoveries and other	[1]	0	1
Ending Balance		26	36
Financing Receivable, Collectively Evaluated for Impairment	[2]			1,200	1,364	[3]
Financing Receivable, Allowance for Credit Losses		25	35	26	36
Other
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance	[4]	2	2
Provision	[4]	0	0
Charge-offs	[4]	0	0
Recoveries and other	[1],[4]	0	0
Ending Balance	[4]	2	2
Financing Receivable, Collectively Evaluated for Impairment	[2],[4]			42	50	[3]
Financing Receivable, Allowance for Credit Losses	[4]	$ 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 $108 at March 31, 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.