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Supplementary Financial Information - Schedule of Trade Receivables Sold and Cash Received (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jul. 31, 2025
Jul. 31, 2024
Jul. 31, 2025
Jul. 31, 2024
Trade Receivables Sold and Cash Received [Roll Forward]        
Balance at beginning of period $ 217 $ 181 $ 284 $ 141
Trade receivables sold 3,085 3,111 9,259 9,256
Cash receipts (3,184) (2,983) (9,431) (9,089)
Foreign currency and other 2 3 8 4
Balance at end of period $ 120 $ 312 $ 120 $ 312