Cash, Cash Equivalents and Investments (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Oct. 28, 2012	Oct. 30, 2011	Oct. 31, 2010
Gains and Losses on Investments
Gross realized gains	$ 3	$ 20	$ 6
Gross realized losses	$ 3	$ 4	$ 2