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Financial Instruments (Details 3) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Derivative disclosures    
Cash held as collateral from counterparties $ 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 to counterparties 72 96
Cash posted as collateral to counterparties through reuse 49  
Cash posted as collateral to counterparties in cash 23  
Total derivatives, gross notional amount 50,262 49,901
Other Current Assets
    
Derivative disclosures    
Derivative asset, fair value 304 320
Long-term Financing Receivables and Other Assets
    
Derivative disclosures    
Derivative asset, fair value 332 608
Other Accrued Liabilities
    
Derivative disclosures    
Derivative liability, fair value 396 612
Other Liabilities
    
Derivative disclosures    
Derivative liability, fair value 122 292
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 28,992 33,297
Derivatives designated as hedging instruments | Other Current Assets
    
Derivative disclosures    
Derivative asset, fair value 217 229
Derivatives designated as hedging instruments | Long-term Financing Receivables and Other Assets
    
Derivative disclosures    
Derivative asset, fair value 315 542
Derivatives designated as hedging instruments | Other Accrued Liabilities
    
Derivative disclosures    
Derivative liability, fair value 313 368
Derivatives designated as hedging instruments | Other Liabilities
    
Derivative disclosures    
Derivative liability, fair value 103 182
Derivatives designated as hedging instruments | Fair value hedges | Interest rate contracts
    
Derivative disclosures    
Total derivatives, gross notional amount 7,900 10,075
Derivatives designated as hedging instruments | Fair value hedges | Interest rate contracts | Other Current Assets
    
Derivative disclosures    
Derivative asset, fair value 43 30
Derivatives designated as hedging instruments | Fair value hedges | Interest rate contracts | Long-term Financing Receivables and Other Assets
    
Derivative disclosures    
Derivative asset, fair value 276 508
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts
    
Derivative disclosures    
Total derivatives, gross notional amount 19,409 21,666
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Other Current Assets
    
Derivative disclosures    
Derivative asset, fair value 160 192
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Long-term Financing Receivables and Other Assets
    
Derivative disclosures    
Derivative asset, fair value 24 30
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Other Accrued Liabilities
    
Derivative disclosures    
Derivative liability, fair value 277 324
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Other Liabilities
    
Derivative disclosures    
Derivative liability, fair value 79 126
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts
    
Derivative disclosures    
Total derivatives, gross notional amount 1,683 1,556
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Other Current Assets
    
Derivative disclosures    
Derivative asset, fair value 14 7
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Long-term Financing Receivables and Other Assets
    
Derivative disclosures    
Derivative asset, fair value 15 4
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Other Accrued Liabilities
    
Derivative disclosures    
Derivative liability, fair value 36 44
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Other Liabilities
    
Derivative disclosures    
Derivative liability, fair value 24 56
Derivatives not designated as hedging instruments
    
Derivative disclosures    
Total derivatives, gross notional amount 21,270 16,604
Derivatives not designated as hedging instruments | Other Current Assets
    
Derivative disclosures    
Derivative asset, fair value 87 91
Derivatives not designated as hedging instruments | Long-term Financing Receivables and Other Assets
    
Derivative disclosures    
Derivative asset, fair value 17 66
Derivatives not designated as hedging instruments | Other Accrued Liabilities
    
Derivative disclosures    
Derivative liability, fair value 83 244
Derivatives not designated as hedging instruments | Other Liabilities
    
Derivative disclosures    
Derivative liability, fair value 19 110
Derivatives not designated as hedging instruments | Foreign exchange contracts
    
Derivative disclosures    
Total derivatives, gross notional amount 18,687 13,994
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other Current Assets
    
Derivative disclosures    
Derivative asset, fair value 61 66
Derivatives not designated as hedging instruments | Foreign exchange contracts | Long-term Financing Receivables and Other Assets
    
Derivative disclosures    
Derivative asset, fair value 17 5
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other Accrued Liabilities
    
Derivative disclosures    
Derivative liability, fair value 51 244
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other Liabilities
    
Derivative disclosures    
Derivative liability, fair value 19 38
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 | Long-term Financing Receivables and Other Assets
    
Derivative disclosures    
Derivative asset, fair value   55
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 | Interest rate contracts | Other Liabilities
    
Derivative disclosures    
Derivative liability, fair value   71
Derivatives not designated as hedging instruments | Other derivatives
    
Derivative disclosures    
Total derivatives, gross notional amount 383 410
Derivatives not designated as hedging instruments | Other derivatives | Other Current Assets
    
Derivative disclosures    
Derivative asset, fair value 1 25
Derivatives not designated as hedging instruments | Other derivatives | Long-term Financing Receivables and Other Assets
    
Derivative disclosures    
Derivative asset, fair value   6
Derivatives not designated as hedging instruments | Other derivatives | Other Accrued Liabilities
    
Derivative disclosures    
Derivative liability, fair value 3  
Derivatives not designated as hedging instruments | Other derivatives | Other Liabilities
    
Derivative disclosures    
Derivative liability, fair value   $ 1