Borrowing Facilities and Debt (Details) - USD ($) $ in Millions	Jul. 26, 2015	Oct. 26, 2014
Schedule of Long term debt
Short-term debt, principal amount	$ 400	$ 0
Total long-term debt	1,547	1,947
Total debt	1,947	1,947
Senior Notes [Member]
Schedule of Long term debt
Long-term debt, principal amount	1,550	1,950
Total unamortized discount	(3)	(3)
Total long-term debt	1,547	1,947
Senior Notes [Member] | 2.650% Unsecured Senior Notes Due 2016, Interest Payable June 15 and December 15 [Member]
Schedule of Long term debt
Short-term debt, principal amount	400	0
Long-term debt, principal amount	$ 0	$ 400
Effective Interest Rate (as percent)	2.666%	2.666%
Stated interest rate (as percent)	2.65%	2.65%
Senior Notes [Member] | 7.125% Unsecured Senior Notes Due 2017, Interest Payable April 15 and October 15 [Member]
Schedule of Long term debt
Long-term debt, principal amount	$ 200	$ 200
Effective Interest Rate (as percent)	7.19%	7.19%
Stated interest rate (as percent)	7.125%	7.125%
Senior Notes [Member] | 4.300% Unsecured Senior Notes Due 2021, Interest Payable June 15 and December 15 [Member]
Schedule of Long term debt
Long-term debt, principal amount	$ 750	$ 750
Effective Interest Rate (as percent)	4.326%	4.326%
Stated interest rate (as percent)	4.30%	4.30%
Senior Notes [Member] | 5.850% Unsecured Senior Notes Due 2041, Interest Payable June 15 and December 15 [Member]
Schedule of Long term debt
Long-term debt, principal amount	$ 600	$ 600
Effective Interest Rate (as percent)	5.879%	5.879%
Stated interest rate (as percent)	5.85%	5.85%