Commitments and Contingencies (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Long-term Purchase Commitment [Line Items]
Unrecognized tax benefits	$ 419	$ 294	$ 207	$ 154
Gross unrecognized tax benefits included in Other Liabilities	392
Gross unrecognized tax benefits included in Accrued Expenses and Other Liabilities	27
Total Contractual Obligations
Long-term Purchase Commitment [Line Items]
2015	261
2016	36
2017	31
2018	26
2019	24
Thereafter	25
Total	403
Facility and equipment leases
Long-term Purchase Commitment [Line Items]
2015	36
2016	31
2017	28
2018	26
2019	24
Thereafter	23
Total	168
Developer and Intellectual Properties
Long-term Purchase Commitment [Line Items]
2015	180
2016	5
2017	3
2018	0
2019	0
Thereafter	2
Total	190
Marketing
Long-term Purchase Commitment [Line Items]
2015	45
2016	0
2017	0
2018	0
2019	0
Thereafter	0
Total	$ 45