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Guarantees, Indemnifications and Warranties (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Guarantees and Product Warranties [Abstract]    
Net receivable $ 1,000  
Changes in aggregated product warranty liabilities    
Balance at beginning of year 898 $ 980
Accruals for warranties issued 1,042 925
Adjustments related to pre-existing warranties (including changes in estimates) (15) (8)
Settlements made (in cash or in kind) (1,010) (999)
Balance at end of year $ 915 $ 898