Pension and Other Benefit Programs - Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	12 Months Ended
	Oct. 01, 2022	Oct. 02, 2021	Oct. 03, 2020
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	$ (81)
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	400	$ 434	$ 410
Interest cost	$ 500	$ 457	$ 527
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest expense, net	Interest expense, net	Interest expense, net
Expected return on plan assets	$ (1,174)	$ (1,100)	$ (1,084)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest expense, net	Interest expense, net	Interest expense, net
Amortization of prior-year service costs	$ 7	$ 11	$ 13
Recognized net actuarial loss	$ 585	$ 777	$ 544
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest expense, net	Interest expense, net	Interest expense, net
Total other costs (benefits)	$ (82)	$ 145	$ 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest expense, net	Interest expense, net	Interest expense, net
Net periodic benefit cost	$ 318	$ 579	$ 410
Postretirement Medical Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	9	10	10
Interest cost	$ 51	$ 47	$ 56
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest expense, net	Interest expense, net	Interest expense, net
Expected return on plan assets	$ (59)	$ (55)	$ (57)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest expense, net	Interest expense, net	Interest expense, net
Amortization of prior-year service costs	$ 0	$ 0	$ 0
Recognized net actuarial loss	$ 28	$ 30	$ 14
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest expense, net	Interest expense, net	Interest expense, net
Total other costs (benefits)	$ 20	$ 22	$ 13
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest expense, net	Interest expense, net	Interest expense, net
Net periodic benefit cost	$ 29	$ 32	$ 23