Equity Changes in Accumulated Other Comprehensive Loss, Tax (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 30, 2024	Apr. 01, 2023	Mar. 30, 2024	Apr. 01, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI Tax, Attributable to Parent, Beginning Balance	$ 692	$ 1,006	$ 595	$ 861
Unrealized gains (losses) arising during the period	(49)	(26)	10	82
Reclassifications of realized net (gains) losses to net income	27	27	65	64
AOCI Tax, Attributable to Parent, Ending Balance	670	1,007	670	1,007
Market Value Adjustments for Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI Tax, Attributable to Parent, Beginning Balance	34	(28)	(64)	(179)
Unrealized gains (losses) arising during the period	(58)	0	8	100
Reclassifications of realized net (gains) losses to net income	21	27	53	78
AOCI Tax, Attributable to Parent, Ending Balance	(3)	(1)	(3)	(1)
Unrecognized Pension and  Postretirement Medical  Expense
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI Tax, Attributable to Parent, Beginning Balance	523	901	517	901
Unrealized gains (losses) arising during the period	0	(16)	0	(16)
Reclassifications of realized net (gains) losses to net income	6	0	12	0
AOCI Tax, Attributable to Parent, Ending Balance	529	885	529	885
Foreign Currency Translation and Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI Tax, Attributable to Parent, Beginning Balance	135	133	142	139
Unrealized gains (losses) arising during the period	9	(10)	2	(2)
Reclassifications of realized net (gains) losses to net income	0	0	0	(14)
AOCI Tax, Attributable to Parent, Ending Balance	$ 144	$ 123	$ 144	$ 123