Cash, Cash Equivalents and Investments (Details 2) (USD $) In Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2011	Aug. 01, 2010	Jul. 31, 2011	Aug. 01, 2010
Gains and Losses on Investments
Gross realized gains	$ 1	$ 1	$ 14	$ 3
Gross realized losses	$ 1	$ 1	$ 2	$ 1