Borrowings - Schedule of Notes Payable and Short-Term Borrowings (Details) - USD ($) $ in Millions	Oct. 31, 2018	Oct. 31, 2017
Debt, Current [Abstract]
Current portion of long-term debt	$ 565	$ 96
Notes payable and short-term borrowings	$ 1,463	$ 1,072
Weighted-Average Interest Rate
Current portion of long-term debt	3.10%	3.50%
Commercial paper
Debt, Current [Abstract]
Commercial paper	$ 854	$ 943
Weighted-Average Interest Rate
Current portion of long-term debt	2.50%	1.80%
Notes payable to banks, lines of credit and other
Debt, Current [Abstract]
Notes payable and short-term borrowings	$ 44	$ 33
Weighted-Average Interest Rate
Current portion of long-term debt	1.70%	1.50%