Acquisitions and Divestitures - Divestitures (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 22, 2012	Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale	$ 0		$ 0			$ 72
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax [Abstract]
Gain from divestiture of the business	12	(19)	(5)	(34)
Income (Loss) from discontinued operations, net of tax			4	(18)
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	27	38	62	74
Operating expenses	48	51	102	99
Loss from operations	(21)	(13)	(40)	(25)
Gain from divestiture of the business	33	0	33	0
Income (loss) before income taxes	12	(13)	(7)	(25)
Income tax expense (benefit)	4	(4)	(3)	(8)
Income (Loss) from discontinued operations, net of tax	$ 8	$ (9)	$ (4)	$ (17)