Property and Equipment, Net (Tables)

9 Months Ended

Sep. 30, 2013

Property Plant And Equipment [Abstract]

Summary of Property and Equipment

Property and equipment, net, consisted of:

	September 30, 2013							December 31, 2012
(in $ millions)	Cost		Accumulated depreciation			Net		Cost		Accumulated depreciation			Net
Capitalized software		651		(447	)		204		629		(386	)		243
Computer equipment		282		(159	)		123		274		(138	)		136
Building and leasehold improvements		16		(8	)		8		12		(7	)		5
Construction in progress		70		—			70		32		—			32
		1,019		(614)			405		947		(531	)		416