Balance Sheet Details - Schedule of Other Liabilities (Details) - USD ($) $ in Millions	Jul. 31, 2017	Oct. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Pension, post-retirement and post-employment liabilities	$ 1,672	$ 2,101
Deferred revenue - long-term	2,603	2,485
Tax liability - long-term	3,692	3,950
Other long-term liabilities	1,108	865
Total	$ 9,075	$ 9,401