Accrued Expenses and Other Liabilities (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accrued Liabilities and Other Liabilities [Abstract]
Benefit (charge) within operating expense	$ 9	$ (9)	$ (4)