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Transformation Programs - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2025
Apr. 30, 2024
Apr. 30, 2025
Apr. 30, 2024
Oct. 31, 2024
Restructuring Cost and Reserve [Line Items]          
Transformation (credit) costs $ (13) $ 33 $ 2 $ 53  
Accrued restructuring 39   39   $ 61
Transformation Program          
Restructuring Cost and Reserve [Line Items]          
Transformation (credit) costs (13) $ 34 2 $ 55  
Accrued restructuring 38   38   61
Transformation Program | Other Accrued Liabilities          
Restructuring Cost and Reserve [Line Items]          
Accrued restructuring 14   14   17
Transformation Program | Long-Term Other Liabilities          
Restructuring Cost and Reserve [Line Items]          
Non-current restructuring liability reported in other liabilities $ 88   $ 88   $ 106