Segments - Business Segments (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) segment	Mar. 31, 2019 USD ($)
Segment Information
Number of reportable segments | segment	2
Segments, Income statement information
Revenue	$ 337	$ 482
Pre-tax income	128	193
Depreciation of equipment under operating lease	31	45
Interest expense	94	150
Provision for/(benefit from) credit losses	19	4
Client Financing
Segments, Income statement information
Revenue	279	322
Pre-tax income	95	117
Depreciation of equipment under operating lease	31	45
Interest expense	82	97
Provision for/(benefit from) credit losses	18	(1)
Commercial Financing
Segments, Income statement information
Revenue	58	160
Pre-tax income	33	76
Interest expense	13	53
Provision for/(benefit from) credit losses	$ 1	$ 5