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Guarantees, Indemnifications and Warranties (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jul. 31, 2020
Oct. 31, 2019
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2020
Jul. 31, 2019
Guarantees [Abstract]            
Tax indemnifications $ 30 $ 57 $ (1) $ (784) $ 0 $ (769)
Changes in aggregated product warranty liabilities            
Balance at beginning of period         922  
Accruals for warranties issued         674  
Adjustments related to pre-existing warranties (including changes in estimates)         (5)  
Settlements made (in cash or in kind)         (700)  
Balance at end of period $ 891 $ 922 $ 891   $ 891