XML 63 R53.htm IDEA: XBRL DOCUMENT v3.21.1
Balance Sheet Details - Allowance for Doubtful Accounts (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Apr. 30, 2021
Oct. 31, 2020
Accounts Receivable, Allowance for Credit Loss    
Balance at beginning of year $ 46 $ 31
Provision for credit losses 5 29
Write off's, net of recoveries (5) (14)
Balance at end of year $ 46 $ 46