Supplementary Financial Information - Other Non-Current Liabilities (Details) - USD ($) $ in Millions	Jan. 31, 2017	Oct. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Pension, post-retirement, and post-employment liabilities	$ 2,627	$ 2,705
Deferred tax liability	1,198	1,116
Tax liability	1,794	1,910
Deferred revenue	866	865
Other	759	737
Other non-current liabilities	$ 7,244	$ 7,333