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Financial Instruments - Schedule of Cash Equivalents and Available-for-Sale Investments (Details) - USD ($)
$ in Millions
Jan. 31, 2019
Oct. 31, 2018
Cash Equivalents:    
Cost $ 2,397 $ 3,996
Fair Value 2,397 3,996
Available-for-Sale Investments:    
Total cash equivalents and available-for-sale investments, Cost 2,867 4,752
Total cash equivalents and available-for-sale investments, Fair Value 2,876 4,760
Debt Securities, Trading, and Equity Securities, FV-NI, Cost 470 756
Debt Securities, Trading, and Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, before Tax 11 11
Debt Securities, Trading, and Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, before Tax (2) (3)
Debt Securities, Trading, and Equity Securities, FV-NI 479 764
Cash Equivalents and Available For Sale Securities, Accumulated Gross Unrealized Gain, before Tax 11 11
Cash Equivalents and Available For Sale Securities, Accumulated Gross Unrealized Loss, before Tax (2) (3)
Corporate debt    
Cash Equivalents:    
Cost 937 1,620
Fair Value 937 1,620
Available-for-Sale Investments:    
Debt Securities, Available-for-sale, Amortized Cost 185 368
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (1) (2)
Debt Securities, Available-for-sale 184 366
Financial institution instruments    
Cash Equivalents:    
Cost 0 9
Fair Value 0 9
Available-for-Sale Investments:    
Debt Securities, Available-for-sale, Amortized Cost 10 32
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 0
Debt Securities, Available-for-sale 10 32
Government debt    
Cash Equivalents:    
Cost 1,460 2,367
Fair Value 1,460 2,367
Available-for-Sale Investments:    
Debt Securities, Available-for-sale, Amortized Cost 232 314
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (1) (1)
Debt Securities, Available-for-sale 231 313
Marketable equity securities    
Available-for-Sale Investments:    
Equity Securities, FV-NI, Cost 4 4
Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, before Tax 2 2
Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, before Tax 0 0
Equity Securities, FV-NI 6 6
Mutual funds    
Available-for-Sale Investments:    
Debt Securities, Available-for-sale, Amortized Cost 39 38
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 9 9
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 0
Debt Securities, Available-for-sale $ 48 $ 47