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Financial Instruments (Details) - USD ($)
$ in Millions
Apr. 30, 2017
Oct. 31, 2016
Cash and Cash Equivalents [Line Items]    
Gross Unrealized Gain $ 39 $ 49
Gross Unrealized Loss (12) (16)
Debt securities:    
Cash and Cash Equivalents [Line Items]    
Gross Unrealized Gain 38 49
Gross Unrealized Loss (12) (12)
Foreign bonds    
Cash and Cash Equivalents [Line Items]    
Gross Unrealized Gain 38 49
Other debt securities    
Cash and Cash Equivalents [Line Items]    
Gross Unrealized Loss (12) (12)
Equity securities in public companies    
Cash and Cash Equivalents [Line Items]    
Gross Unrealized Gain 1 0
Gross Unrealized Loss 0 (4)
Equity securities in public companies    
Cash and Cash Equivalents [Line Items]    
Gross Unrealized Gain 1 0
Gross Unrealized Loss 0 (4)
Cost    
Cash and Cash Equivalents [Line Items]    
Cash Equivalents: 5,280 10,519
Available-for-sale securities, Cost 254 202
Total cash equivalents and available-for-sale investments 5,534 10,721
Cost | Debt securities:    
Cash and Cash Equivalents [Line Items]    
Available-for-sale securities, Cost 234 182
Cost | Time deposits    
Cash and Cash Equivalents [Line Items]    
Available-for-sale securities, Cost 11 11
Cost | Foreign bonds    
Cash and Cash Equivalents [Line Items]    
Available-for-sale securities, Cost 184 131
Cost | Other debt securities    
Cash and Cash Equivalents [Line Items]    
Available-for-sale securities, Cost 39 40
Cost | Equity securities in public companies    
Cash and Cash Equivalents [Line Items]    
Available-for-sale securities, Cost 20 20
Cost | Equity securities in public companies    
Cash and Cash Equivalents [Line Items]    
Available-for-sale securities, Cost 20 20
Cost | Time deposits    
Cash and Cash Equivalents [Line Items]    
Cash Equivalents: 2,435 4,024
Cost | Money market funds    
Cash and Cash Equivalents [Line Items]    
Cash Equivalents: 2,845 6,495
Fair Value    
Cash and Cash Equivalents [Line Items]    
Cash Equivalents: 5,280 10,519
Available-for-sale securities, Estimated Fair Value 281 235
Total cash equivalents and available-for-sale investments 5,561 10,754
Fair Value | Debt securities:    
Cash and Cash Equivalents [Line Items]    
Available-for-sale securities, Estimated Fair Value 260 219
Fair Value | Time deposits    
Cash and Cash Equivalents [Line Items]    
Available-for-sale securities, Estimated Fair Value 11 11
Fair Value | Foreign bonds    
Cash and Cash Equivalents [Line Items]    
Available-for-sale securities, Estimated Fair Value 222 180
Fair Value | Other debt securities    
Cash and Cash Equivalents [Line Items]    
Available-for-sale securities, Estimated Fair Value 27 28
Fair Value | Equity securities in public companies    
Cash and Cash Equivalents [Line Items]    
Available-for-sale securities, Estimated Fair Value 21 16
Fair Value | Equity securities in public companies    
Cash and Cash Equivalents [Line Items]    
Available-for-sale securities, Estimated Fair Value 21 16
Fair Value | Time deposits    
Cash and Cash Equivalents [Line Items]    
Cash Equivalents: 2,435 4,024
Fair Value | Money market funds    
Cash and Cash Equivalents [Line Items]    
Cash Equivalents: $ 2,845 $ 6,495