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Supplementary Financial Information - Other Non-Current Liabilities (Details) - USD ($)
$ in Millions
Apr. 30, 2021
Oct. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Pension, post-retirement, and post-employment liabilities $ 1,413 $ 1,576
Deferred revenue 1,053 1,072
Operating lease liabilities 867 904
Tax liability 714 746
Deferred tax liability 35 25
Other 881 823
Other non-current liabilities $ 4,963 $ 5,146