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Supplementary Financial Information - Other Non-Current Liabilities (Details) - USD ($)
$ in Millions
Apr. 30, 2020
Oct. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Pension, post-retirement, and post-employment liabilities $ 1,599 $ 1,762
Deferred revenue 1,042 1,069
Operating lease liabilities 899  
Tax liability 843 848
Deferred tax liability 62 60
Other 854 848
Other non-current liabilities $ 5,299 $ 4,587