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Segment Information - Revenue by Geographic Region (Details) - USD ($)
$ in Millions
3 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Segment Reporting Information [Line Items]    
Total net revenue $ 6,949 $ 7,553
Total Americas    
Segment Reporting Information [Line Items]    
Total net revenue 2,786 3,005
United States    
Segment Reporting Information [Line Items]    
Total net revenue 2,318 2,501
Americas excluding U.S.    
Segment Reporting Information [Line Items]    
Total net revenue 468 504
Europe, Middle East and Africa    
Segment Reporting Information [Line Items]    
Total net revenue 2,560 2,910
Asia Pacific and Japan    
Segment Reporting Information [Line Items]    
Total net revenue $ 1,603 $ 1,638