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Consolidated Balance Sheets (Parenthetical) - $ / shares
Oct. 31, 2021
Oct. 31, 2020
Statement of Financial Position [Abstract]    
Common stock, par value ($ per share) $ 0.01 $ 0.01
Common stock, authorized (shares) 9,600,000,000 9,600,000,000
Common stock, issued (shares) 1,295,000,000 1,287,000,000
Common stock, outstanding (shares) 1,295,000,000 1,287,000,000