Supplementary Financial Information - Other Non-Current Liabilities (Details) - USD ($) $ in Millions	Apr. 30, 2017	Oct. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Pension, post-retirement, and post-employment liabilities	$ 2,543	$ 2,705
Deferred tax liability	1,412	1,116
Tax liability	1,756	1,910
Deferred revenue	872	865
Other	744	737
Other non-current liabilities	$ 7,327	$ 7,333