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A One Percentage Point Change Effects on Projected Benefit Obligations (Detail) (USD $)
In Millions
12 Months Ended
Oct. 01, 2011
Defined Benefit Plan Disclosure [Line Items] 
Impact of 1 ppt Discount Rate decrease on Benefit Expense$ 223
Impact of 1 ppt Discount Rate increase on Benefit Expense(193)
Impact of 1 ppt Discount Rate decrease on Projected Benefit Obligations1,876
Impact of 1 ppt Discount Rate increase on Projected Benefit Obligations(1,589)
Impact of 1 ppt Expected Long-Term Rate of Return on Assets decrease on Benefit Expense69
Impact of 1 ppt Expected Long-Term Rate of Return on Assets increase on Benefit Expense(69)
Impact of 1 ppt Healthcare Cost Trend Rate decrease on Net Periodic Postretirement Medical Cost(38)
Impact of 1 ppt Healthcare Cost Trend Rate increase on Net Periodic Postretirement Medical Cost54
Impact of 1 ppt Healthcare Cost Trend Rate decrease on Projected Benefit Obligations(228)
Impact of 1 ppt Healthcare Cost Trend Rate increase on Projected Benefit Obligations$ 285