Other Charges (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Unusual or Infrequent Item [Line Items]
Restructuring costs	$ 0	$ 4	$ 0	$ 4
Licensing dispute settlement	7	0	7	0
Costs related to mergers and acquisitions	5	0	5	5
Total other charges	$ 12	$ 4	$ 12	$ 9