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Financial Instruments (Details 3) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Apr. 30, 2013
Oct. 31, 2012
Derivative disclosures    
Cash held as collateral from counterparties $ 266 $ 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   72
Cash posted as collateral to counterparties through reuse 137 49
Cash posted as collateral to counterparties in cash   23
Total derivatives, gross notional amount 46,827 50,262
Other Current Assets
    
Derivative disclosures    
Derivative asset, fair value 279 304
Long-term Financing Receivables and Other Assets
    
Derivative disclosures    
Derivative asset, fair value 296 332
Other Accrued Liabilities
    
Derivative disclosures    
Derivative liability, fair value 456 396
Other Liabilities
    
Derivative disclosures    
Derivative liability, fair value 110 122
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 28,031 28,992
Derivatives designated as hedging instruments | Other Current Assets
    
Derivative disclosures    
Derivative asset, fair value 173 217
Derivatives designated as hedging instruments | Long-term Financing Receivables and Other Assets
    
Derivative disclosures    
Derivative asset, fair value 281 315
Derivatives designated as hedging instruments | Other Accrued Liabilities
    
Derivative disclosures    
Derivative liability, fair value 361 313
Derivatives designated as hedging instruments | Other Liabilities
    
Derivative disclosures    
Derivative liability, fair value 95 103
Derivatives designated as hedging instruments | Fair value hedges | Interest rate contracts
    
Derivative disclosures    
Total derivatives, gross notional amount 8,900 7,900
Derivatives designated as hedging instruments | Fair value hedges | Interest rate contracts | Other Current Assets
    
Derivative disclosures    
Derivative asset, fair value 38 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 210 276
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts
    
Derivative disclosures    
Total derivatives, gross notional amount 17,230 19,409
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Other Current Assets
    
Derivative disclosures    
Derivative asset, fair value 123 160
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Long-term Financing Receivables and Other Assets
    
Derivative disclosures    
Derivative asset, fair value 49 24
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Other Accrued Liabilities
    
Derivative disclosures    
Derivative liability, fair value 332 277
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Other Liabilities
    
Derivative disclosures    
Derivative liability, fair value 70 79
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts
    
Derivative disclosures    
Total derivatives, gross notional amount 1,901 1,683
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Other Current Assets
    
Derivative disclosures    
Derivative asset, fair value 12 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 22 15
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Other Accrued Liabilities
    
Derivative disclosures    
Derivative liability, fair value 29 36
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Other Liabilities
    
Derivative disclosures    
Derivative liability, fair value 25 24
Derivatives not designated as hedging instruments
    
Derivative disclosures    
Total derivatives, gross notional amount 18,796 21,270
Derivatives not designated as hedging instruments | Other Current Assets
    
Derivative disclosures    
Derivative asset, fair value 106 87
Derivatives not designated as hedging instruments | Long-term Financing Receivables and Other Assets
    
Derivative disclosures    
Derivative asset, fair value 15 17
Derivatives not designated as hedging instruments | Other Accrued Liabilities
    
Derivative disclosures    
Derivative liability, fair value 95 83
Derivatives not designated as hedging instruments | Other Liabilities
    
Derivative disclosures    
Derivative liability, fair value 15 19
Derivatives not designated as hedging instruments | Foreign exchange contracts
    
Derivative disclosures    
Total derivatives, gross notional amount 16,246 18,687
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other Current Assets
    
Derivative disclosures    
Derivative asset, fair value 90 61
Derivatives not designated as hedging instruments | Foreign exchange contracts | Long-term Financing Receivables and Other Assets
    
Derivative disclosures    
Derivative asset, fair value 14 17
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other Accrued Liabilities
    
Derivative disclosures    
Derivative liability, fair value 85 51
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other Liabilities
    
Derivative disclosures    
Derivative liability, fair value 15 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 9 25
Derivatives not designated as hedging instruments | Interest rate contracts | Other Accrued Liabilities
    
Derivative disclosures    
Derivative liability, fair value 10 29
Derivatives not designated as hedging instruments | Other derivatives
    
Derivative disclosures    
Total derivatives, gross notional amount 350 383
Derivatives not designated as hedging instruments | Other derivatives | Other Current Assets
    
Derivative disclosures    
Derivative asset, fair value 7 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