Borrowings - Schedule of Notes Payable and Short-Term Borrowings (Details) - USD ($) $ in Millions	Jul. 31, 2018	Oct. 31, 2017
Amount Outstanding
Current portion of long-term debt	$ 547	$ 96
Amount outstanding	$ 2,681	$ 1,072
Weighted-Average Interest Rate
Current portion of long-term debt	3.10%	3.50%
Commercial paper
Amount Outstanding
Commercial paper	$ 2,092	$ 943
Weighted-Average Interest Rate
Notes payable to banks, lines of credit and other	2.60%	1.80%
Notes payable to banks, lines of credit and other
Amount Outstanding
Amount outstanding	$ 42	$ 33
Weighted-Average Interest Rate
Notes payable to banks, lines of credit and other	1.10%	1.50%