Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		48 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Apr. 25, 2013
Loss Contingencies [Line Items]
Term of Qualcomm Agreement					4 years
Gain related to litigation settlement	$ 2	$ (27)	$ (86)	$ 23
Minimum claims of patent infringement			1 year
Maximum claims of patent infringement			4 years
Summary of Significant Accounting Policies (Textual) [Abstract]
Accrued potential rebates			100.00%
Maximum original maturity of liquid investments to be consider as cash equivalents			3 months
Qualcomm [Member]
Loss Contingencies [Line Items]
Gain related to litigation settlement			$ 65