Income Taxes (Details 4) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Deferred income tax assets:
Allowance for credit losses	$ 96	$ 148
Tax carryforwards	43	73
Deferred tax assets, gross	139	221
Deferred income tax liabilities (primarily lease basis differences)	(441)	(693)
Valuation allowance for deferred income tax assets	(11)	(10)
Deferred income tax on translation adjustment	(165)	(368)
Deferred income taxes, net	$ (478)	$ (850)