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Financial Instruments (Details 3) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Investments, All Other Investments [Abstract]    
Period within which the funds held as collateral and posted as collateral are transferred from or to counterparties 2 days  
Collateralized arrangements in net liability position $ 290 $ 265
Derivatives, Fair Value    
Total derivatives, gross notional amount 23,894 28,294
Other Current Assets    
Derivatives, Fair Value    
Derivative asset, fair value 343 202
Long-Term Financing Receivables and Other Assets    
Derivatives, Fair Value    
Derivative asset, fair value 153 58
Other Accrued Liabilities    
Derivatives, Fair Value    
Derivative liability, fair value 85 232
Long-Term Other Liabilities    
Derivatives, Fair Value    
Derivative liability, fair value $ 391 245
Cash flow hedges    
Derivatives, Fair Value    
Maturity period of foreign currency cash flow hedges 12 months  
Cash flow hedges | Maximum    
Derivatives, Fair Value    
Duration of lease term for which lease-related forward contracts and intercompany lease loan forward contracts can be extended 5 years  
Derivatives designated as hedging instruments    
Derivatives, Fair Value    
Total derivatives, gross notional amount $ 17,010 18,646
Derivatives designated as hedging instruments | Other Current Assets    
Derivatives, Fair Value    
Derivative asset, fair value 302 140
Derivatives designated as hedging instruments | Long-Term Financing Receivables and Other Assets    
Derivatives, Fair Value    
Derivative asset, fair value 148 55
Derivatives designated as hedging instruments | Other Accrued Liabilities    
Derivatives, Fair Value    
Derivative liability, fair value 24 153
Derivatives designated as hedging instruments | Long-Term Other Liabilities    
Derivatives, Fair Value    
Derivative liability, fair value 379 237
Derivatives designated as hedging instruments | Fair value hedges | Interest rate contracts    
Derivatives, Fair Value    
Total derivatives, gross notional amount 6,850 9,500
Derivatives designated as hedging instruments | Fair value hedges | Interest rate contracts | Long-Term Financing Receivables and Other Assets    
Derivatives, Fair Value    
Derivative asset, fair value 0 0
Derivatives designated as hedging instruments | Fair value hedges | Interest rate contracts | Other Accrued Liabilities    
Derivatives, Fair Value    
Derivative liability, fair value 0 16
Derivatives designated as hedging instruments | Fair value hedges | Interest rate contracts | Long-Term Other Liabilities    
Derivatives, Fair Value    
Derivative liability, fair value 353 126
Derivatives designated as hedging instruments | Cash flow hedges | Foreign currency contracts    
Derivatives, Fair Value    
Total derivatives, gross notional amount 8,423 7,202
Derivatives designated as hedging instruments | Cash flow hedges | Foreign currency contracts | Other Current Assets    
Derivatives, Fair Value    
Derivative asset, fair value 270 105
Derivatives designated as hedging instruments | Cash flow hedges | Foreign currency contracts | Long-Term Financing Receivables and Other Assets    
Derivatives, Fair Value    
Derivative asset, fair value 107 45
Derivatives designated as hedging instruments | Cash flow hedges | Foreign currency contracts | Other Accrued Liabilities    
Derivatives, Fair Value    
Derivative liability, fair value 11 101
Derivatives designated as hedging instruments | Cash flow hedges | Foreign currency contracts | Long-Term Other Liabilities    
Derivatives, Fair Value    
Derivative liability, fair value 15 70
Derivatives designated as hedging instruments | Net investment hedges | Foreign currency contracts    
Derivatives, Fair Value    
Total derivatives, gross notional amount 1,737 1,944
Derivatives designated as hedging instruments | Net investment hedges | Foreign currency contracts | Other Current Assets    
Derivatives, Fair Value    
Derivative asset, fair value 32 35
Derivatives designated as hedging instruments | Net investment hedges | Foreign currency contracts | Long-Term Financing Receivables and Other Assets    
Derivatives, Fair Value    
Derivative asset, fair value 41 10
Derivatives designated as hedging instruments | Net investment hedges | Foreign currency contracts | Other Accrued Liabilities    
Derivatives, Fair Value    
Derivative liability, fair value 13 36
Derivatives designated as hedging instruments | Net investment hedges | Foreign currency contracts | Long-Term Other Liabilities    
Derivatives, Fair Value    
Derivative liability, fair value 11 41
Derivatives not designated as hedging instruments    
Derivatives, Fair Value    
Total derivatives, gross notional amount 6,884 9,648
Derivatives not designated as hedging instruments | Other Current Assets    
Derivatives, Fair Value    
Derivative asset, fair value 41 62
Derivatives not designated as hedging instruments | Long-Term Financing Receivables and Other Assets    
Derivatives, Fair Value    
Derivative asset, fair value 5 3
Derivatives not designated as hedging instruments | Other Accrued Liabilities    
Derivatives, Fair Value    
Derivative liability, fair value 61 79
Derivatives not designated as hedging instruments | Long-Term Other Liabilities    
Derivatives, Fair Value    
Derivative liability, fair value 12 8
Derivatives not designated as hedging instruments | Foreign currency contracts    
Derivatives, Fair Value    
Total derivatives, gross notional amount 6,780 9,552
Derivatives not designated as hedging instruments | Foreign currency contracts | Other Current Assets    
Derivatives, Fair Value    
Derivative asset, fair value 41 61
Derivatives not designated as hedging instruments | Foreign currency contracts | Long-Term Financing Receivables and Other Assets    
Derivatives, Fair Value    
Derivative asset, fair value 5 3
Derivatives not designated as hedging instruments | Foreign currency contracts | Other Accrued Liabilities    
Derivatives, Fair Value    
Derivative liability, fair value 55 79
Derivatives not designated as hedging instruments | Foreign currency contracts | Long-Term Other Liabilities    
Derivatives, Fair Value    
Derivative liability, fair value 12 8
Derivatives not designated as hedging instruments | Other derivatives    
Derivatives, Fair Value    
Total derivatives, gross notional amount 104 96
Derivatives not designated as hedging instruments | Other derivatives | Other Current Assets    
Derivatives, Fair Value    
Derivative asset, fair value 0 1
Derivatives not designated as hedging instruments | Other derivatives | Other Accrued Liabilities    
Derivatives, Fair Value    
Derivative liability, fair value 6 0
Derivatives not designated as hedging instruments | Other derivatives | Long-Term Other Liabilities    
Derivatives, Fair Value    
Derivative liability, fair value $ 0 $ 0