Property and Equipment - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 132	$ 135	$ 107
Property and equipment, net	1,029	1,460
International Operations | Total segment
Property, Plant and Equipment [Line Items]
Property and equipment, net	229	291
Property and Equipment
Property, Plant and Equipment [Line Items]
Interest capitalized	$ 9	33	31
Lower Limit
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Upper Limit
Property, Plant and Equipment [Line Items]
Estimated useful lives	40 years
Reimbursed Costs
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 58	$ 51	$ 48