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Financial Instruments - Cash Equivalents and Available-for-Sale Investments (Details) - USD ($)
$ in Millions
Jan. 31, 2019
Oct. 31, 2018
Cash and Cash Equivalents [Line Items]    
Total cash and equivalents and available-for-sale investments, Cost basis $ 2,382 $ 3,260
Gross Unrealized Gain 17 18
Gross Unrealized Loss (1) (1)
Total cash equivalents and available-for-sale debt investments 2,398 3,277
Cost    
Cash and Cash Equivalents [Line Items]    
Total cash equivalents 2,243 3,121
Cost | Time deposits    
Cash and Cash Equivalents [Line Items]    
Total cash equivalents 521 781
Cost | Money market funds    
Cash and Cash Equivalents [Line Items]    
Total cash equivalents 1,722 2,340
Fair Value    
Cash and Cash Equivalents [Line Items]    
Total cash equivalents 2,243 3,121
Fair Value | Time deposits    
Cash and Cash Equivalents [Line Items]    
Total cash equivalents 521 781
Fair Value | Money market funds    
Cash and Cash Equivalents [Line Items]    
Total cash equivalents 1,722 2,340
Debt securities    
Cash and Cash Equivalents [Line Items]    
Debt securities, Amortized Cost 139 139
Debt securities, Gross Unrealized Gain 17 18
Debt securities, Gross Unrealized Loss (1) (1)
Debt securities, Fair Value 155 156
Foreign bonds    
Cash and Cash Equivalents [Line Items]    
Debt securities, Amortized Cost 114 113
Debt securities, Gross Unrealized Gain 17 18
Debt securities, Gross Unrealized Loss 0 0
Debt securities, Fair Value 131 131
Other debt securities    
Cash and Cash Equivalents [Line Items]    
Debt securities, Amortized Cost 25 26
Debt securities, Gross Unrealized Gain 0 0
Debt securities, Gross Unrealized Loss (1) (1)
Debt securities, Fair Value $ 24 $ 25