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Financial Instruments - Pre-tax Effect of Derivative Instruments on Statement of Earnings (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 30, 2025
Apr. 30, 2024
Apr. 30, 2025
Apr. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items]        
Net revenue $ 7,627 $ 7,204 $ 15,481 $ 13,959
Interest and other, net 39 (22) 78 (110)
Net Revenue        
Derivative Instruments, Gain (Loss) [Line Items]        
Total gains (losses) 39 22 83 46
Interest and Other, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Total gains (losses) (413) 150 (186) (28)
Interest rate contracts | Net Revenue        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (Losses) on Derivatives in Fair Value Hedging Relationships: 0 0 0 0
Interest rate contracts | Interest and Other, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (Losses) on Derivatives in Fair Value Hedging Relationships: (15) 15 (30) (32)
Derivatives Designated as Hedging Instruments | Interest rate contracts | Net Revenue        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (Losses) on Derivatives in Fair Value Hedging Relationships: 0 0 0 0
Derivatives Designated as Hedging Instruments | Interest rate contracts | Interest and Other, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (Losses) on Derivatives in Fair Value Hedging Relationships: 15 (15) 30 32
Derivatives Designated as Hedging Instruments | Foreign currency contracts | Net Revenue        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gains (losses) reclassified from accumulated other comprehensive income into income 39 22 83 46
Derivatives Designated as Hedging Instruments | Foreign currency contracts | Interest and Other, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gains (losses) reclassified from accumulated other comprehensive income into income (283) 93 (113) (45)
Derivatives Designated as Hedging Instruments | Interest Rate Locks | Net Revenue        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gains (losses) reclassified from accumulated other comprehensive income into income 0 0 0 0
Derivatives Designated as Hedging Instruments | Interest Rate Locks | Interest and Other, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gains (losses) reclassified from accumulated other comprehensive income into income 0 0 (1) 0
Derivatives Not Designated as Hedging Instruments | Foreign currency contracts | Net Revenue        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (Losses) on Derivatives not Designated as Hedging Instruments: 0 0 0 0
Derivatives Not Designated as Hedging Instruments | Foreign currency contracts | Interest and Other, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (Losses) on Derivatives not Designated as Hedging Instruments: (130) 62 (76) 18
Derivatives Not Designated as Hedging Instruments | Other derivatives | Net Revenue        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (Losses) on Derivatives not Designated as Hedging Instruments: 0 0 0 0
Derivatives Not Designated as Hedging Instruments | Other derivatives | Interest and Other, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (Losses) on Derivatives not Designated as Hedging Instruments: $ 0 $ (5) $ 4 $ (1)