Acquisitions and Divestitures - Divestitures (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets Held-for-sale, Current	$ 61		$ 72
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax [Abstract]
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax	(9)	(6)
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
Disposal Group, Including Discontinued Operation, Property, Plant, and Equipment, Net	51		64
Disposal Group, Including Discontinued Operation, Inventory	8		6
Disposal Group, Including Discontinued Operation, Intangible Assets, Net	2		2
Assets Held-for-sale, Current	61		72
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax [Abstract]
Discontinued Operation, Revenue from Discontinued Operation During Phase-out Period, before Income Tax	35	36
Discontinued Operation, Operating Expenses from Discontinued Operation During Phase-out Period, before Income Tax	54	48
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax	(19)	(12)
Discontinued Operation, Tax Effect of Income (Loss) from Discontinued Operation During Phase-out Period	7	4
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax	$ (12)	$ (8)