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Financial Instruments - Fair Value of Derivative Instruments in the Consolidated Balance Sheets (Details) - USD ($) $ in Millions | Oct. 31, 2018 | Oct. 31, 2017
--- | --- | ---
Investment Holdings [Line Items] |  |
Outstanding Gross Notional | $ 23,655 | $ 24,573
Total Assets | 515 | 121
Total Liabilities | 195 | 372
Other Current Assets |  |
Investment Holdings [Line Items] |  |
Total Assets | 408 | 109
Other Non-Current Assets |  |
Investment Holdings [Line Items] |  |
Total Assets | 107 | 12
Other Accrued Liabilities |  |
Investment Holdings [Line Items] |  |
Total Liabilities | 120 | 260
Other Non-Current Liabilities |  |
Investment Holdings [Line Items] |  |
Total Liabilities | 75 | 112
Derivatives designated as hedging instruments |  |
Investment Holdings [Line Items] |  |
Outstanding Gross Notional | 18,147 | 18,649
Derivatives designated as hedging instruments | Other Current Assets |  |
Investment Holdings [Line Items] |  |
Total Assets | 386 | 92
Derivatives designated as hedging instruments | Other Non-Current Assets |  |
Investment Holdings [Line Items] |  |
Total Assets | 107 | 12
Derivatives designated as hedging instruments | Other Accrued Liabilities |  |
Investment Holdings [Line Items] |  |
Total Liabilities | 86 | 245
Derivatives designated as hedging instruments | Other Non-Current Liabilities |  |
Investment Holdings [Line Items] |  |
Total Liabilities | 75 | 112
Derivatives designated as hedging instruments | Interest rate contracts | Fair value hedges |  |
Investment Holdings [Line Items] |  |
Outstanding Gross Notional | 1,000 | 2,500
Derivatives designated as hedging instruments | Interest rate contracts | Other Current Assets | Fair value hedges |  |
Investment Holdings [Line Items] |  |
Total Assets | 0 | 0
Derivatives designated as hedging instruments | Interest rate contracts | Other Non-Current Assets | Fair value hedges |  |
Investment Holdings [Line Items] |  |
Total Assets | 0 | 0
Derivatives designated as hedging instruments | Interest rate contracts | Other Accrued Liabilities | Fair value hedges |  |
Investment Holdings [Line Items] |  |
Total Liabilities | 0 | 0
Derivatives designated as hedging instruments | Interest rate contracts | Other Non-Current Liabilities | Fair value hedges |  |
Investment Holdings [Line Items] |  |
Total Liabilities | 23 | 12
Derivatives designated as hedging instruments | Foreign currency contracts | Cash flow hedges |  |
Investment Holdings [Line Items] |  |
Outstanding Gross Notional | 17,147 | 16,149
Derivatives designated as hedging instruments | Foreign currency contracts | Other Current Assets | Cash flow hedges |  |
Investment Holdings [Line Items] |  |
Total Assets | 386 | 92
Derivatives designated as hedging instruments | Foreign currency contracts | Other Non-Current Assets | Cash flow hedges |  |
Investment Holdings [Line Items] |  |
Total Assets | 107 | 12
Derivatives designated as hedging instruments | Foreign currency contracts | Other Accrued Liabilities | Cash flow hedges |  |
Investment Holdings [Line Items] |  |
Total Liabilities | 86 | 245
Derivatives designated as hedging instruments | Foreign currency contracts | Other Non-Current Liabilities | Cash flow hedges |  |
Investment Holdings [Line Items] |  |
Total Liabilities | 52 | 100
Derivatives not designated as hedging instruments |  |
Investment Holdings [Line Items] |  |
Outstanding Gross Notional | 5,508 | 5,924
Derivatives not designated as hedging instruments | Other Current Assets |  |
Investment Holdings [Line Items] |  |
Total Assets | 22 | 17
Derivatives not designated as hedging instruments | Other Non-Current Assets |  |
Investment Holdings [Line Items] |  |
Total Assets | 0 | 0
Derivatives not designated as hedging instruments | Other Accrued Liabilities |  |
Investment Holdings [Line Items] |  |
Total Liabilities | 34 | 15
Derivatives not designated as hedging instruments | Other Non-Current Liabilities |  |
Investment Holdings [Line Items] |  |
Total Liabilities | 0 | 0
Derivatives not designated as hedging instruments | Foreign currency contracts |  |
Investment Holdings [Line Items] |  |
Outstanding Gross Notional | 5,437 | 5,801
Derivatives not designated as hedging instruments | Foreign currency contracts | Other Current Assets |  |
Investment Holdings [Line Items] |  |
Total Assets | 22 | 16
Derivatives not designated as hedging instruments | Foreign currency contracts | Other Non-Current Assets |  |
Investment Holdings [Line Items] |  |
Total Assets | 0 | 0
Derivatives not designated as hedging instruments | Foreign currency contracts | Other Accrued Liabilities |  |
Investment Holdings [Line Items] |  |
Total Liabilities | 26 | 15
Derivatives not designated as hedging instruments | Foreign currency contracts | Other Non-Current Liabilities |  |
Investment Holdings [Line Items] |  |
Total Liabilities | 0 | 0
Derivatives not designated as hedging instruments | Other derivatives |  |
Investment Holdings [Line Items] |  |
Outstanding Gross Notional | 71 | 123
Derivatives not designated as hedging instruments | Other derivatives | Other Current Assets |  |
Investment Holdings [Line Items] |  |
Total Assets | 0 | 1
Derivatives not designated as hedging instruments | Other derivatives | Other Non-Current Assets |  |
Investment Holdings [Line Items] |  |
Total Assets | 0 | 0
Derivatives not designated as hedging instruments | Other derivatives | Other Accrued Liabilities |  |
Investment Holdings [Line Items] |  |
Total Liabilities | 8 | 0
Derivatives not designated as hedging instruments | Other derivatives | Other Non-Current Liabilities |  |
Investment Holdings [Line Items] |  |
Total Liabilities | $ 0 | $ 0

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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