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Supplementary Financial Information - Schedule of Transferred Trade Receivables Not Collected from Third Parties (Details) - USD ($)
$ in Millions
 3 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Trade Receivables Sold and Cash Received Roll Forward    
Balance at beginning of period $ 165 $ 147
Trade receivables sold 3,036 2,936
Cash receipts (3,010) (2,921)
Foreign currency and other 3 10
Balance at end of period $ 194 $ 172