Commitments and Contingencies (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Commitments
Unrecognized tax benefits	$ 154	$ 132	$ 139	$ 103
Total Contractual Obligations
Commitments
2012	173
2013	79
2014	43
2015	18
2016	15
Thereafter	60
Total	388
Facility and equipment leases
Commitments
2012	33
2013	30
2014	27
2015	18
2016	15
Thereafter	60
Total	183
Developer and Intellectual Properties
Commitments
2012	108
2013	49
2014	16
2015	0
2016	0
Thereafter	0
Total	173
Marketing
Commitments
2012	32
2013	0
2014	0
2015	0
2016	0
Thereafter	0
Total	$ 32