Income Taxes (Details 2) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Reserves not yet deducted for tax purposes	$ 23	$ 28
State income taxes	9	11
Other	1	2
Gross deferred tax assets	33	41
Deferred tax liabilities:
Investment in foreign subsidiaries	0	1
Foreign exchange gain	8	0
Gross deferred tax liabilities	8	1
Net deferred tax assets	$ 25	$ 40