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Supplementary Financial Information - Schedule of Transferred Trade Receivables Not Collected from Third Parties (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2019
Apr. 30, 2018
Trade Receivables Sold and Cash Received Roll Forward        
Balance at beginning of period $ 194 $ 172 $ 165 $ 147
Trade receivables sold 2,490 2,434 5,525 5,370
Cash receipts (2,498) (2,430) (5,507) (5,351)
Foreign currency and other (4) (5) (1) 5
Balance at end of period $ 182 $ 171 $ 182 $ 171