Valuation Accounts And Reserves (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			12 Months Ended
	Dec. 31, 2011 Doubtful Accounts And Allowances [Member]	Dec. 31, 2009 Doubtful Accounts And Allowances [Member]	Dec. 31, 2008 Doubtful Accounts And Allowances [Member]	Dec. 31, 2011 Deferred Tax Assets Valuation Allowance [Member]	Dec. 31, 2010 Deferred Tax Assets Valuation Allowance [Member]	Dec. 31, 2009 Deferred Tax Assets Valuation Allowance [Member]	Dec. 31, 2011 Accumulated Amortization Of Purchased Intangible Assets [Member]	Dec. 31, 2010 Accumulated Amortization Of Purchased Intangible Assets [Member]	Dec. 31, 2009 Accumulated Amortization Of Purchased Intangible Assets [Member]	Dec. 31, 2011 Reserves For Accrued Costs Of Business Restructuring [Member]	Dec. 31, 2010 Reserves For Accrued Costs Of Business Restructuring [Member]	Dec. 31, 2009 Reserves For Accrued Costs Of Business Restructuring [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	$ 20	$ 20	$ 20	$ 214	$ 245	$ 230	$ 221	$ 217	$ 204	$ 27	$ 100	$ 34
Additions				15		15	15	4	13			209
Net deductions and other	1			10	31		101			17	73	143
Balance at end of period	$ 19	$ 20	$ 20	$ 219	$ 214	$ 245	$ 135	$ 221	$ 217	$ 10	$ 27	$ 100