Changes in Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 29, 2024	Jul. 01, 2023	Jun. 29, 2024	Jul. 01, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	$ (3,509)	$ (4,389)	$ (3,292)	$ (4,119)
Unrealized gains (losses) arising during the period	156	31	154	(13)
Reclassifications of realized net (gains) losses to net income	(101)	(55)	(316)	(281)
AOCI, Ending Balance	(3,454)	(4,413)	(3,454)	(4,413)
Market Value Adjustments for Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	(9)	1	195	625
Unrealized gains (losses) arising during the period	181	66	156	(302)
Reclassifications of realized net (gains) losses to net income	(83)	(56)	(262)	(312)
AOCI, Ending Balance	89	11	89	11
Unrecognized Pension and  Postretirement Medical  Expense
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	(1,700)	(2,812)	(1,655)	(2,869)
Unrealized gains (losses) arising during the period	(2)	0	(11)	55
Reclassifications of realized net (gains) losses to net income	(18)	1	(54)	3
AOCI, Ending Balance	(1,720)	(2,811)	(1,720)	(2,811)
Foreign Currency Translation and Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	(1,800)	(1,578)	(1,832)	(1,875)
Unrealized gains (losses) arising during the period	(23)	(35)	9	234
Reclassifications of realized net (gains) losses to net income	0	0	0	28
AOCI, Ending Balance	$ (1,823)	$ (1,613)	$ (1,823)	$ (1,613)