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Financial Instruments (Details 3) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Apr. 30, 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 $ 258 $ 207
Derivatives, Fair Value    
Total derivatives, gross notional amount 45,541 51,875
Derivative asset, fair value 363 452
Derivative liability, fair value 705 656
Other Current Assets
    
Derivatives, Fair Value    
Derivative asset, fair value 153 220
Long-Term Financing Receivables and Other Assets
    
Derivatives, Fair Value    
Derivative asset, fair value 210 232
Other Accrued Liabilities
    
Derivatives, Fair Value    
Derivative liability, fair value 415 437
Long-Term Other Liabilities
    
Derivatives, Fair Value    
Derivative liability, fair value 290 219
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 32,669 35,483
Derivatives designated as hedging instruments | Other Current Assets
    
Derivatives, Fair Value    
Derivative asset, fair value 115 140
Derivatives designated as hedging instruments | Long-Term Financing Receivables and Other Assets
    
Derivatives, Fair Value    
Derivative asset, fair value 184 205
Derivatives designated as hedging instruments | Other Accrued Liabilities
    
Derivatives, Fair Value    
Derivative liability, fair value 362 361
Derivatives designated as hedging instruments | Long-Term Other Liabilities
    
Derivatives, Fair Value    
Derivative liability, fair value 268 199
Derivatives designated as hedging instruments | Fair value hedges | Interest rate contracts
    
Derivatives, Fair Value    
Total derivatives, gross notional amount 10,550 11,100
Derivatives designated as hedging instruments | Fair value hedges | Interest rate contracts | Other Current Assets
    
Derivatives, Fair Value    
Derivative asset, fair value 3 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 111 125
Derivatives designated as hedging instruments | Fair value hedges | Interest rate contracts | Long-Term Other Liabilities
    
Derivatives, Fair Value    
Derivative liability, fair value 111 107
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts
    
Derivatives, Fair Value    
Total derivatives, gross notional amount 20,144 22,463
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Other Current Assets
    
Derivatives, Fair Value    
Derivative asset, fair value 82 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 32 40
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Other Accrued Liabilities
    
Derivatives, Fair Value    
Derivative liability, fair value 349 341
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Long-Term Other Liabilities
    
Derivatives, Fair Value    
Derivative liability, fair value 138 80
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts
    
Derivatives, Fair Value    
Total derivatives, gross notional amount 1,975 1,920
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Other Current Assets
    
Derivatives, Fair Value    
Derivative asset, fair value 30 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 41 40
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Other Accrued Liabilities
    
Derivatives, Fair Value    
Derivative liability, fair value 13 20
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Long-Term Other Liabilities
    
Derivatives, Fair Value    
Derivative liability, fair value 19 12
Derivatives not designated as hedging instruments
    
Derivatives, Fair Value    
Total derivatives, gross notional amount 12,872 16,392
Derivatives not designated as hedging instruments | Other Current Assets
    
Derivatives, Fair Value    
Derivative asset, fair value 38 80
Derivatives not designated as hedging instruments | Long-Term Financing Receivables and Other Assets
    
Derivatives, Fair Value    
Derivative asset, fair value 26 27
Derivatives not designated as hedging instruments | Other Accrued Liabilities
    
Derivatives, Fair Value    
Derivative liability, fair value 53 76
Derivatives not designated as hedging instruments | Long-Term Other Liabilities
    
Derivatives, Fair Value    
Derivative liability, fair value 22 20
Derivatives not designated as hedging instruments | Foreign exchange contracts
    
Derivatives, Fair Value    
Total derivatives, gross notional amount 12,535 16,048
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other Current Assets
    
Derivatives, Fair Value    
Derivative asset, fair value 36 72
Derivatives not designated as hedging instruments | Foreign exchange contracts | Long-Term Financing Receivables and Other Assets
    
Derivatives, Fair Value    
Derivative asset, fair value 25 26
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other Accrued Liabilities
    
Derivatives, Fair Value    
Derivative liability, fair value 51 76
Derivatives not designated as hedging instruments | Foreign exchange contracts | Long-Term Other Liabilities
    
Derivatives, Fair Value    
Derivative liability, fair value 22 20
Derivatives not designated as hedging instruments | Other derivatives
    
Derivatives, Fair Value    
Total derivatives, gross notional amount 337 344
Derivatives not designated as hedging instruments | Other derivatives | Other Current Assets
    
Derivatives, Fair Value    
Derivative asset, fair value 2 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 $ 2