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Financial Instruments (Details 3) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Jul. 31, 2013
Oct. 31, 2012
Derivative disclosures    
Cash held as collateral from counterparties $ 177 $ 198
Number of business days in which the funds held as collateral and posted as collateral, from/to counterparties are transferred 2 days  
Cash posted as collateral under collateralized arrangements 114 72
Cash posted as collateral to counterparties through reuse 101 49
Cash posted as collateral to counterparties in cash 13 23
Total derivatives, gross notional amount 53,689 50,262
Other Current Assets
    
Derivative disclosures    
Derivative asset, fair value 400 304
Long-term Financing Receivables and Other Assets
    
Derivative disclosures    
Derivative asset, fair value 297 332
Other Accrued Liabilities
    
Derivative disclosures    
Derivative liability, fair value 342 396
Other Liabilities
    
Derivative disclosures    
Derivative liability, fair value 225 122
Cash flow hedges
    
Cash flow hedges    
Maturity period of foreign currency cash flow hedges 12 months  
Maximum maturity period for lease-related cash flow hedges 5 years  
Derivatives designated as hedging instruments
    
Derivative disclosures    
Total derivatives, gross notional amount 34,371 28,992
Derivatives designated as hedging instruments | Other Current Assets
    
Derivative disclosures    
Derivative asset, fair value 257 217
Derivatives designated as hedging instruments | Long-term Financing Receivables and Other Assets
    
Derivative disclosures    
Derivative asset, fair value 254 315
Derivatives designated as hedging instruments | Other Accrued Liabilities
    
Derivative disclosures    
Derivative liability, fair value 271 313
Derivatives designated as hedging instruments | Other Liabilities
    
Derivative disclosures    
Derivative liability, fair value 199 103
Derivatives designated as hedging instruments | Fair value hedges | Interest rate contracts
    
Derivative disclosures    
Total derivatives, gross notional amount 12,200 7,900
Derivatives designated as hedging instruments | Fair value hedges | Interest rate contracts | Other Current Assets
    
Derivative disclosures    
Derivative asset, fair value 47 43
Derivatives designated as hedging instruments | Fair value hedges | Interest rate contracts | Long-term Financing Receivables and Other Assets
    
Derivative disclosures    
Derivative asset, fair value 115 276
Derivatives designated as hedging instruments | Fair value hedges | Interest rate contracts | Other Liabilities
    
Derivative disclosures    
Derivative liability, fair value 144  
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts
    
Derivative disclosures    
Total derivatives, gross notional amount 20,286 19,409
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Other Current Assets
    
Derivative disclosures    
Derivative asset, fair value 175 160
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Long-term Financing Receivables and Other Assets
    
Derivative disclosures    
Derivative asset, fair value 89 24
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Other Accrued Liabilities
    
Derivative disclosures    
Derivative liability, fair value 259 277
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Other Liabilities
    
Derivative disclosures    
Derivative liability, fair value 47 79
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts
    
Derivative disclosures    
Total derivatives, gross notional amount 1,885 1,683
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Other Current Assets
    
Derivative disclosures    
Derivative asset, fair value 35 14
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Long-term Financing Receivables and Other Assets
    
Derivative disclosures    
Derivative asset, fair value 50 15
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Other Accrued Liabilities
    
Derivative disclosures    
Derivative liability, fair value 12 36
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Other Liabilities
    
Derivative disclosures    
Derivative liability, fair value 8 24
Derivatives not designated as hedging instruments
    
Derivative disclosures    
Total derivatives, gross notional amount 19,318 21,270
Derivatives not designated as hedging instruments | Other Current Assets
    
Derivative disclosures    
Derivative asset, fair value 143 87
Derivatives not designated as hedging instruments | Long-term Financing Receivables and Other Assets
    
Derivative disclosures    
Derivative asset, fair value 43 17
Derivatives not designated as hedging instruments | Other Accrued Liabilities
    
Derivative disclosures    
Derivative liability, fair value 71 83
Derivatives not designated as hedging instruments | Other Liabilities
    
Derivative disclosures    
Derivative liability, fair value 26 19
Derivatives not designated as hedging instruments | Foreign exchange contracts
    
Derivative disclosures    
Total derivatives, gross notional amount 16,783 18,687
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other Current Assets
    
Derivative disclosures    
Derivative asset, fair value 134 61
Derivatives not designated as hedging instruments | Foreign exchange contracts | Long-term Financing Receivables and Other Assets
    
Derivative disclosures    
Derivative asset, fair value 42 17
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other Accrued Liabilities
    
Derivative disclosures    
Derivative liability, fair value 71 51
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other Liabilities
    
Derivative disclosures    
Derivative liability, fair value 26 19
Derivatives not designated as hedging instruments | Interest rate contracts
    
Derivative disclosures    
Total derivatives, gross notional amount 2,200 2,200
Derivatives not designated as hedging instruments | Interest rate contracts | Other Current Assets
    
Derivative disclosures    
Derivative asset, fair value   25
Derivatives not designated as hedging instruments | Interest rate contracts | Other Accrued Liabilities
    
Derivative disclosures    
Derivative liability, fair value   29
Derivatives not designated as hedging instruments | Other derivatives
    
Derivative disclosures    
Total derivatives, gross notional amount 335 383
Derivatives not designated as hedging instruments | Other derivatives | Other Current Assets
    
Derivative disclosures    
Derivative asset, fair value 9 1
Derivatives not designated as hedging instruments | Other derivatives | Long-term Financing Receivables and Other Assets
    
Derivative disclosures    
Derivative asset, fair value 1  
Derivatives not designated as hedging instruments | Other derivatives | Other Accrued Liabilities
    
Derivative disclosures    
Derivative liability, fair value   $ 3