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Guarantees (Details) (USD $)
In Millions
6 Months Ended
Apr. 30, 2011
Changes in aggregated product warranty liabilities  
Product warranty liability at the beginning of the period $ 2,447
Accruals for warranties issued 1,334
Adjustments related to pre-existing warranties (including changes in estimates) (38)
Settlements made (in cash or in kind) (1,313)
Product warranty liability at the end of the period $ 2,430