Equity Changes in Accumulated Other Comprehensive Loss, 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 Tax, Attributable to Parent, Beginning Balance	$ 670	$ 1,007	$ 595	$ 861
Unrealized gains (losses) arising during the period	(55)	(10)	(45)	72
Reclassifications of realized net (gains) losses to net income	32	17	97	81
AOCI Tax, Attributable to Parent, Ending Balance	647	1,014	647	1,014
Market Value Adjustments for Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI Tax, Attributable to Parent, Beginning Balance	(3)	(1)	(64)	(179)
Unrealized gains (losses) arising during the period	(54)	(19)	(46)	81
Reclassifications of realized net (gains) losses to net income	26	17	79	95
AOCI Tax, Attributable to Parent, Ending Balance	(31)	(3)	(31)	(3)
Unrecognized Pension and  Postretirement Medical  Expense
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI Tax, Attributable to Parent, Beginning Balance	529	885	517	901
Unrealized gains (losses) arising during the period	0	0	0	(16)
Reclassifications of realized net (gains) losses to net income	6	0	18	0
AOCI Tax, Attributable to Parent, Ending Balance	535	885	535	885
Foreign Currency Translation and Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI Tax, Attributable to Parent, Beginning Balance	144	123	142	139
Unrealized gains (losses) arising during the period	(1)	9	1	7
Reclassifications of realized net (gains) losses to net income	0	0	0	(14)
AOCI Tax, Attributable to Parent, Ending Balance	$ 143	$ 132	$ 143	$ 132