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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