Commitments and Contingencies (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Long-term Purchase Commitment [Line Items]
Unrecognized tax benefits	$ 207	$ 154	$ 132	$ 139
Income tax liabilities, non-current	197	146
Reduction in previously unrecognized tax benefits within next twelve months	10
Total Contractual Obligations
Long-term Purchase Commitment [Line Items]
2013	210
2014	87
2015	23
2016	24
2017	23
Thereafter	55
Total	422
Facility and equipment leases
Long-term Purchase Commitment [Line Items]
2013	33
2014	31
2015	22
2016	18
2017	17
Thereafter	52
Total	173
Developer and Intellectual Properties
Long-term Purchase Commitment [Line Items]
2013	119
2014	5
2015	1
2016	0
2017	0
Thereafter	3
Total	128
Marketing
Long-term Purchase Commitment [Line Items]
2013	58
2014	51
2015	0
2016	6
2017	6
Thereafter	0
Total	$ 121