Acquisitions and Divestitures - Divestitures (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Jun. 22, 2012	Dec. 31, 2011
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax [Abstract]
Gain from divestiture of the business	$ (2)	$ (10)	$ (7)	$ (44)
Income (Loss) from discontinued operations, net of tax			3	(25)
Entertainment Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Maximum Purchase Price Expected for Sale of Business					100
Business Disposal, Software and Services Margin Threshold Triggering Additional Payment	25		25
Assets held for sale					67	72
Disposal Group, Including Discontinued Operation, Property, Plant, and Equipment, Net					51	64
Disposal Group, Including Discontinued Operation, Inventory					15	6
Disposal Group, Including Discontinued Operation, Intangible Assets, Net					1	2
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax [Abstract]
Revenue	1	41	62	115
Operating expenses	3	51	104	150
Loss from operations	(2)	(10)	(42)	(35)
Gain from divestiture of the business	0	0	33	0
Income (loss) before income taxes	(2)	(10)	(9)	(35)
Income tax expense (benefit)	(1)	(3)	(4)	(11)
Income (Loss) from discontinued operations, net of tax	$ (1)	$ (7)	$ (5)	$ (24)