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Financial Instruments (Details 3) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Jul. 31, 2014
Oct. 31, 2013
Financial Instruments    
Period within which the funds held posted as collateral from or to counterparties 2 days  
Derivative liability, fair value which were substantially collateralized $ 66 $ 207
Derivatives, Fair Value    
Total derivatives, gross notional amount 47,399 51,875
Derivative asset, fair value 447 452
Derivative liability, fair value 464 656
Other Current Assets
    
Derivatives, Fair Value    
Derivative asset, fair value 270 220
Long-Term Financing Receivables and Other Assets
    
Derivatives, Fair Value    
Derivative asset, fair value 177 232
Other Accrued Liabilities
    
Derivatives, Fair Value    
Derivative liability, fair value 239 437
Long-Term Other Liabilities
    
Derivatives, Fair Value    
Derivative liability, fair value 225 219
Cash flow hedges
    
Derivatives, Fair Value    
Maturity period of foreign currency cash flow hedges 12 months  
Maximum 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 31,779 35,483
Derivatives designated as hedging instruments | Other Current Assets
    
Derivatives, Fair Value    
Derivative asset, fair value 208 140
Derivatives designated as hedging instruments | Long-Term Financing Receivables and Other Assets
    
Derivatives, Fair Value    
Derivative asset, fair value 156 205
Derivatives designated as hedging instruments | Other Accrued Liabilities
    
Derivatives, Fair Value    
Derivative liability, fair value 183 361
Derivatives designated as hedging instruments | Long-Term Other Liabilities
    
Derivatives, Fair Value    
Derivative liability, fair value 205 199
Derivatives designated as hedging instruments | Fair value hedges | Interest rate contracts
    
Derivatives, Fair Value    
Total derivatives, gross notional amount 9,800 11,100
Derivatives designated as hedging instruments | Fair value hedges | Interest rate contracts | Other Current Assets
    
Derivatives, Fair Value    
Derivative asset, fair value   31
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 91 125
Derivatives designated as hedging instruments | Fair value hedges | Interest rate contracts | Long-Term Other Liabilities
    
Derivatives, Fair Value    
Derivative liability, fair value 105 107
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts
    
Derivatives, Fair Value    
Total derivatives, gross notional amount 20,041 22,463
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Other Current Assets
    
Derivatives, Fair Value    
Derivative asset, fair value 183 79
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Long-Term Financing Receivables and Other Assets
    
Derivatives, Fair Value    
Derivative asset, fair value 35 40
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Other Accrued Liabilities
    
Derivatives, Fair Value    
Derivative liability, fair value 168 341
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Long-Term Other Liabilities
    
Derivatives, Fair Value    
Derivative liability, fair value 84 80
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts
    
Derivatives, Fair Value    
Total derivatives, gross notional amount 1,938 1,920
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Other Current Assets
    
Derivatives, Fair Value    
Derivative asset, fair value 25 30
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Long-Term Financing Receivables and Other Assets
    
Derivatives, Fair Value    
Derivative asset, fair value 30 40
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Other Accrued Liabilities
    
Derivatives, Fair Value    
Derivative liability, fair value 15 20
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Long-Term Other Liabilities
    
Derivatives, Fair Value    
Derivative liability, fair value 16 12
Derivatives not designated as hedging instruments
    
Derivatives, Fair Value    
Total derivatives, gross notional amount 15,620 16,392
Derivatives not designated as hedging instruments | Other Current Assets
    
Derivatives, Fair Value    
Derivative asset, fair value 62 80
Derivatives not designated as hedging instruments | Long-Term Financing Receivables and Other Assets
    
Derivatives, Fair Value    
Derivative asset, fair value 21 27
Derivatives not designated as hedging instruments | Other Accrued Liabilities
    
Derivatives, Fair Value    
Derivative liability, fair value 56 76
Derivatives not designated as hedging instruments | Long-Term Other Liabilities
    
Derivatives, Fair Value    
Derivative liability, fair value 20 20
Derivatives not designated as hedging instruments | Foreign exchange contracts
    
Derivatives, Fair Value    
Total derivatives, gross notional amount 15,272 16,048
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other Current Assets
    
Derivatives, Fair Value    
Derivative asset, fair value 61 72
Derivatives not designated as hedging instruments | Foreign exchange contracts | Long-Term Financing Receivables and Other Assets
    
Derivatives, Fair Value    
Derivative asset, fair value 20 26
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other Accrued Liabilities
    
Derivatives, Fair Value    
Derivative liability, fair value 49 76
Derivatives not designated as hedging instruments | Foreign exchange contracts | Long-Term Other Liabilities
    
Derivatives, Fair Value    
Derivative liability, fair value 20 20
Derivatives not designated as hedging instruments | Other derivatives
    
Derivatives, Fair Value    
Total derivatives, gross notional amount 348 344
Derivatives not designated as hedging instruments | Other derivatives | Other Current Assets
    
Derivatives, Fair Value    
Derivative asset, fair value 1 8
Derivatives not designated as hedging instruments | Other derivatives | Long-Term Financing Receivables and Other Assets
    
Derivatives, Fair Value    
Derivative asset, fair value 1 1
Derivatives not designated as hedging instruments | Other derivatives | Other Accrued Liabilities
    
Derivatives, Fair Value    
Derivative liability, fair value $ 7