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Supplementary Financial Information - Schedule of Allowance for Credit Losses Related to Accounts Receivable and Changes (Details)
$ in Millions
9 Months Ended
Jul. 31, 2025
USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]  
Balance at beginning of period $ 83
Current-period allowance for credit losses 6
Deductions, net of recoveries (6)
Balance at end of period $ 83