Equity Changes in Accumulated Other Comprehensive Loss, Tax (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 01, 2023	Apr. 02, 2022	Apr. 01, 2023	Apr. 02, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI Tax, Attributable to Parent, Beginning Balance	$ 1,006	$ 1,714	$ 861	$ 1,784
Unrealized gains (losses) arising during the period	(26)	4	82	(34)
Reclassifications of realized net (gains) losses to net income	27	(31)	64	(63)
AOCI Tax, Attributable to Parent, Ending Balance	1,007	1,687	1,007	1,687
Market Value Adjustments for Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI Tax, Attributable to Parent, Beginning Balance	(28)	23	(179)	42
Unrealized gains (losses) arising during the period	0	(9)	100	(32)
Reclassifications of realized net (gains) losses to net income	27	5	78	9
AOCI Tax, Attributable to Parent, Ending Balance	(1)	19	(1)	19
Unrecognized Pension and  Postretirement Medical  Expense
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI Tax, Attributable to Parent, Beginning Balance	901	1,606	901	1,653
Unrealized gains (losses) arising during the period	(16)	0	(16)	(11)
Reclassifications of realized net (gains) losses to net income	0	(36)	0	(72)
AOCI Tax, Attributable to Parent, Ending Balance	885	1,570	885	1,570
Foreign Currency Translation and Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI Tax, Attributable to Parent, Beginning Balance	133	85	139	89
Unrealized gains (losses) arising during the period	(10)	13	(2)	9
Reclassifications of realized net (gains) losses to net income	0	0	(14)	0
AOCI Tax, Attributable to Parent, Ending Balance	$ 123	$ 98	$ 123	$ 98