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Financial Instruments - Cash Equivalents and Available-for-Sale Investments (Details) - USD ($)
$ in Millions
Apr. 30, 2018
Oct. 31, 2017
Cash and Cash Equivalents [Line Items]    
Debt securities, Amortized Cost $ 152  
Debt securities, Fair Value 173  
Total cash and equivalents and available-for-sale investments, Cost basis 5,196 $ 6,971
Gross Unrealized Gain 23 40
Gross Unrealized Loss (2) (11)
Total cash equivalents and available-for-sale investments 5,217 7,000
Cost    
Cash and Cash Equivalents [Line Items]    
Total cash equivalents 5,044 6,751
Cost | Time deposits    
Cash and Cash Equivalents [Line Items]    
Total cash equivalents 1,653 1,159
Cost | Money market funds    
Cash and Cash Equivalents [Line Items]    
Total cash equivalents 3,391 5,592
Fair Value    
Cash and Cash Equivalents [Line Items]    
Total cash equivalents 5,044 6,751
Fair Value | Time deposits    
Cash and Cash Equivalents [Line Items]    
Total cash equivalents 1,653 1,159
Fair Value | Money market funds    
Cash and Cash Equivalents [Line Items]    
Total cash equivalents 3,391 5,592
Debt securities    
Cash and Cash Equivalents [Line Items]    
Debt securities, Amortized Cost 152 220
Debt securities, Gross Unrealized Gain 23 40
Debt securities, Gross Unrealized Loss (2) (11)
Debt securities, Fair Value 173 249
Time deposits    
Cash and Cash Equivalents [Line Items]    
Debt securities, Amortized Cost 3 0
Debt securities, Gross Unrealized Gain 0 0
Debt securities, Gross Unrealized Loss 0 0
Debt securities, Fair Value 3 0
Foreign bonds    
Cash and Cash Equivalents [Line Items]    
Debt securities, Amortized Cost 121 183
Debt securities, Gross Unrealized Gain 23 40
Debt securities, Gross Unrealized Loss 0 0
Debt securities, Fair Value 144 223
Other debt securities    
Cash and Cash Equivalents [Line Items]    
Debt securities, Amortized Cost 28 37
Debt securities, Gross Unrealized Gain 0 0
Debt securities, Gross Unrealized Loss (2) (11)
Debt securities, Fair Value $ 26 $ 26