Valuation Accounts And Reserves (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Doubtful Accounts And Allowances [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	$ 19	$ 20	$ 20
Additions	7
Net deductions and other		1
Balance at end of period	26	19	20
Deferred Tax Assets Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	219	214	245
Additions		15
Net deductions and other	9	10	31
Balance at end of period	210	219	214
Accumulated Amortization Of Purchased Intangible Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	135	221	217
Additions	19	15	4
Net deductions and other		101
Balance at end of period	154	135	221
Reserves For Accrued Costs Of Business Restructuring [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	10	27	100
Additions	52
Net deductions and other	20	17	73
Balance at end of period	$ 42	$ 10	$ 27