Cash, Cash Equivalents and Investments (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jul. 29, 2012	Jul. 31, 2011	Jul. 29, 2012	Jul. 31, 2011
Gains and Losses on Investments
Gross realized gains	$ 1	$ 1	$ 2	$ 14
Gross realized losses	$ 1	$ 1	$ 2	$ 2