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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. 01, 2016
USD ($)
Compensation and Retirement Disclosure [Abstract]  
Impact of 1 ppt Discount Rate decrease on Benefit Expense $ 271
Impact of 1 ppt Discount Rate increase on Benefit Expense (235)
Impact of 1 ppt Discount Rate decrease on Projected Benefit Obligations 2,853
Impact of 1 ppt Discount Rate increase on Projected Benefit Obligations (2,401)
Impact of 1 ppt Expected Long-Term Rate of Return on Assets Decrease on Benefit Expense 123
Impact of 1 ppt Expected Long-Term Rate of Return on Assets Increase on Benefit Expense (123)
Impact of 1 ppt Healthcare Cost Trend Rate decrease on Net Periodic Postretirement Medical Cost (25)
Impact of 1 ppt Healthcare Cost Trend Rate increase on Net Periodic Postretirement Medical Cost 41
Impact of 1 ppt Healthcare Cost Trend Rate decrease on Projected Benefit Obligations (233)
Impact of 1 ppt Healthcare Cost Trend Rate increase on Projected Benefit Obligations $ 287