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Pension and Other Benefit Programs - One Percentage Point (ppt) Change on Projected Benefit Obligations (Detail)
$ in Millions
12 Months Ended
Oct. 03, 2015
USD ($)
Compensation and Retirement Disclosure [Abstract]  
Impact of 1 ppt Discount Rate decrease on Benefit Expense $ 230
Impact of 1 ppt Discount Rate increase on Benefit Expense (223)
Impact of 1 ppt Discount Rate decrease on Projected Benefit Obligations 2,501
Impact of 1 ppt Discount Rate increase on Projected Benefit Obligations (2,122)
Impact of 1 ppt Expected Long-Term Rate of Return on Assets Decrease on Benefit Expense 105
Impact of 1 ppt Expected Long-Term Rate of Return on Assets Increase on Benefit Expense (105)
Impact of 1 ppt Healthcare Cost Trend Rate decrease on Net Periodic Postretirement Medical Cost (32)
Impact of 1 ppt Healthcare Cost Trend Rate increase on Net Periodic Postretirement Medical Cost 29
Impact of 1 ppt Healthcare Cost Trend Rate decrease on Projected Benefit Obligations (217)
Impact of 1 ppt Healthcare Cost Trend Rate increase on Projected Benefit Obligations $ 269