Borrowings (Details) - USD ($) $ in Millions	Jan. 31, 2016	Oct. 31, 2015
Notes Payable and Short-Term Borrowings
Current portion of long-term debt	$ 20	$ 2,160
Amount outstanding	$ 49	$ 2,194
Current portion of long-term debt, weighted average interest rate (as a percent)	5.40%	3.30%
U.S. Dollar Global Notes
Notes Payable and Short-Term Borrowings
Principal amount of debt redeemed and repaid	$ 2,100
Obligation related to notes payable to banks, lines of credit, uncommitted line of credit and other debt
Notes Payable and Short-Term Borrowings
Amount outstanding	$ 29	$ 34
Weighted average interest rate (as a percent)	3.70%	4.70%