XML 84 R72.htm IDEA: XBRL DOCUMENT v3.10.0.1
Financial Instruments - Cash Equivalents and Available-for-Sale Investments (Details) - USD ($)
$ in Millions
Jul. 31, 2018
Oct. 31, 2017
Cash and Cash Equivalents [Line Items]    
Total cash and equivalents and available-for-sale investments, Cost basis $ 3,558 $ 6,971
Gross Unrealized Gain 21 40
Gross Unrealized Loss (2) (11)
Total cash equivalents and available-for-sale investments 3,577 7,000
Cost    
Cash and Cash Equivalents [Line Items]    
Total cash equivalents 3,415 6,751
Cost | Time deposits    
Cash and Cash Equivalents [Line Items]    
Total cash equivalents 954 1,159
Cost | Money market funds    
Cash and Cash Equivalents [Line Items]    
Total cash equivalents 2,461 5,592
Fair Value    
Cash and Cash Equivalents [Line Items]    
Total cash equivalents 3,415 6,751
Fair Value | Time deposits    
Cash and Cash Equivalents [Line Items]    
Total cash equivalents 954 1,159
Fair Value | Money market funds    
Cash and Cash Equivalents [Line Items]    
Total cash equivalents 2,461 5,592
Debt securities    
Cash and Cash Equivalents [Line Items]    
Debt securities, Amortized Cost 143 220
Debt securities, Gross Unrealized Gain 21 40
Debt securities, Gross Unrealized Loss (2) (11)
Debt securities, Fair Value 162 249
Foreign bonds    
Cash and Cash Equivalents [Line Items]    
Debt securities, Amortized Cost 116 183
Debt securities, Gross Unrealized Gain 21 40
Debt securities, Gross Unrealized Loss 0 0
Debt securities, Fair Value 137 223
Other debt securities    
Cash and Cash Equivalents [Line Items]    
Debt securities, Amortized Cost 27 37
Debt securities, Gross Unrealized Gain 0 0
Debt securities, Gross Unrealized Loss (2) (11)
Debt securities, Fair Value $ 25 $ 26