Overview and Summary of Significant Accounting Policies - table (Details) - USD ($) $ in Millions	Oct. 31, 2016	Oct. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other current assets	$ 4,324	$ 6,468
Long-term financing receivables and other assets	13,216	10,875
Taxes on earnings	$ (420)	(476)
Other liabilities		(8,902)
Historical Accounting Method
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other current assets		7,677
Long-term financing receivables and other assets		11,020
Taxes on earnings		(634)
Other liabilities		(10,098)
Accounting Standards Update 2015-17 | Effect of Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other current assets		(1,209)
Long-term financing receivables and other assets		(145)
Taxes on earnings		158
Other liabilities		$ 1,196