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Financial Instruments - Cash Equivalents and Available-for-Sale Investments (Details) - USD ($)
$ in Millions
Apr. 30, 2025
Oct. 31, 2024
Cash and Cash Equivalents [Line Items]    
Gross Unrealized Gains $ 2 $ 8
Total cash and equivalents and available-for-sale investments, Cost basis 10,418 13,349
Total cash equivalents and available-for-sale debt investments 10,420 13,357
Cost    
Cash and Cash Equivalents [Line Items]    
Total cash equivalents 10,304 13,240
Cost | Time deposits    
Cash and Cash Equivalents [Line Items]    
Total cash equivalents 2,335 601
Cost | Money market funds    
Cash and Cash Equivalents [Line Items]    
Total cash equivalents 7,969 12,639
Fair Value    
Cash and Cash Equivalents [Line Items]    
Total cash equivalents 10,304 13,240
Fair Value | Time deposits    
Cash and Cash Equivalents [Line Items]    
Total cash equivalents 2,335 601
Fair Value | Money market funds    
Cash and Cash Equivalents [Line Items]    
Total cash equivalents 7,969 12,639
Debt securities    
Cash and Cash Equivalents [Line Items]    
Debt securities, available-for-sale, amortized cost, total 114 109
Gross Unrealized Gains 2 8
Fair Value 116 117
Foreign bonds    
Cash and Cash Equivalents [Line Items]    
Debt securities, available-for-sale, amortized cost, total 107 101
Gross Unrealized Gains 0 2
Fair Value 107 103
Other debt securities    
Cash and Cash Equivalents [Line Items]    
Debt securities, available-for-sale, amortized cost, total 7 8
Gross Unrealized Gains 2 6
Fair Value $ 9 $ 14