Property and Equipment, Net (Tables)

6 Months Ended

Jun. 30, 2013

Property Plant And Equipment [Abstract]

Summary of property and equipment

Property and equipment, net, consisted of:

	June 30, 2013						December 31, 2012
(in $ millions)	Cost		Accumulated depreciation		Net		Cost		Accumulated depreciation		Net
Capitalized software		640		(429)		211		629		(386)		243
Computer equipment		274		(148)		126		274		(138)		136
Building and leasehold improvements		15		(8)		7		12		(7)		5
Construction in progress		57		—		57		32		—		32
		986		(585)		401		947		(531)		416