Borrowing Facilities and Long-Term Debt (Details) (USD $) In Millions, unless otherwise specified	Jul. 31, 2011		Oct. 31, 2010
Schedule of Long term debt
Principal amount	$ 1,951		$ 205
Less unamortized discount	(4)		0
Current portion	0	[1]	(1)	[1]
Total long-term debt	1,947	[1]	204	[1]
4.300% unsecured senior notes due 2021, interest payable June 15 and December 15 [Member]
Schedule of Long term debt
Principal amount	750
Debt, interest rate, stated percentage	4.30%
Debt, interest rate, effective percentage	4.326%
Interest Pay Date	--06-15
Interest Pay Date	--12-15
5.850% unsecured senior notes due 2041, interest payable June 15 and December 15 [Member]
Schedule of Long term debt
Principal amount	600
Debt, interest rate, stated percentage	5.85%
Debt, interest rate, effective percentage	5.879%
Interest Pay Date	--06-15
Interest Pay Date	--12-15
2.650% unsecured senior notes due 2016, interest payable June 15 and December 15 [Member]
Schedule of Long term debt
Principal amount	400
Debt, interest rate, stated percentage	2.65%
Debt, interest rate, effective percentage	2.666%
Interest Pay Date	--06-15
Interest Pay Date	--12-15
7.125% unsecured senior notes due 2017, interest payable April 15 and October 15 [Member]
Schedule of Long term debt
Principal amount	200		200
Debt, interest rate, stated percentage	7.125%		7.125%
Debt, interest rate, effective percentage	7.19%		7.19%
Interest Pay Date	--04-15		--04-15
Interest Pay Date	--10-15		--10-15
Other Long Term Debt [Member]
Schedule of Long term debt
Principal amount	$ 1		$ 5

[1] Amounts as of July 31, 2011 are unaudited. Amounts as of October 31, 2010 are derived from the October 31, 2010 audited consolidated financial statements.