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Guarantees, Indemnifications, and Warranties (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jul. 31, 2019
Jul. 31, 2019
Jul. 31, 2018
Oct. 31, 2018
Guarantees [Abstract]        
Tax indemnifications receivable $ 100 $ 100   $ 1,000
Change in Tax Indemnification 764 764 $ 676  
Changes in aggregated product warranty liabilities        
Balance at beginning of period   915    
Accruals for warranties issued   777    
Adjustments related to pre-existing warranties (including changes in estimates)   (1)    
Settlements made (in cash or in kind)   (786)    
Balance at end of period $ 905 $ 905