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Supplementary Financial Information - Other Accrued Liabilities (Details) - USD ($)
$ in Millions
Oct. 31, 2018
Oct. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Other accrued taxes $ 982 $ 895
Warranty 673 660
Deferred revenue 1,095 1,012
Sales and marketing programs 2,758 2,441
Other 1,868 1,945
Other Accrued Liabilities, total $ 7,376 $ 6,953