Equity Changes in Accumulated Other Comprehensive Loss, Before 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 before Tax, Attributable to Parent, Beginning Balance	$ (4,179)	$ (5,396)	$ (3,887)	$ (4,980)
Unrealized gains (losses) arising during the period	211	41	199	(85)
Reclassifications of realized net (gains) losses to net income	(133)	(72)	(413)	(362)
AOCI before Tax, Attributable to Parent, Ending Balance	(4,101)	(5,427)	(4,101)	(5,427)
Market Value Adjustments for Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI before Tax, Attributable to Parent, Beginning Balance	(6)	2	259	804
Unrealized gains (losses) arising during the period	235	85	202	(383)
Reclassifications of realized net (gains) losses to net income	(109)	(73)	(341)	(407)
AOCI before Tax, Attributable to Parent, Ending Balance	120	14	120	14
Unrecognized Pension and  Postretirement Medical  Expense
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI before Tax, Attributable to Parent, Beginning Balance	(2,229)	(3,697)	(2,172)	(3,770)
Unrealized gains (losses) arising during the period	(2)	0	(11)	71
Reclassifications of realized net (gains) losses to net income	(24)	1	(72)	3
AOCI before Tax, Attributable to Parent, Ending Balance	(2,255)	(3,696)	(2,255)	(3,696)
Foreign Currency Translation and Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI before Tax, Attributable to Parent, Beginning Balance	(1,944)	(1,701)	(1,974)	(2,014)
Unrealized gains (losses) arising during the period	(22)	(44)	8	227
Reclassifications of realized net (gains) losses to net income	0	0	0	42
AOCI before Tax, Attributable to Parent, Ending Balance	$ (1,966)	$ (1,745)	$ (1,966)	$ (1,745)