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Guarantees, Indemnifications and Warranties (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2020
Oct. 31, 2019
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2020
Apr. 30, 2019
Guarantees [Abstract]            
Tax indemnifications $ 63 $ 57 $ 1 $ 5 $ 1 $ 15
Changes in aggregated product warranty liabilities            
Balance at beginning of period         922  
Accruals for warranties issued         446  
Adjustments related to pre-existing warranties (including changes in estimates)         (3)  
Settlements made (in cash or in kind)         (467)  
Balance at end of period $ 898 $ 922 $ 898   $ 898