Equity Changes in Accumulated Other Comprehensive Loss, Tax (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 01, 2023	Jul. 02, 2022	Jul. 01, 2023	Jul. 02, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI Tax, Attributable to Parent, Beginning Balance	$ 1,007	$ 1,687	$ 861	$ 1,784
Unrealized gains (losses) arising during the period	(10)	(125)	72	(159)
Reclassifications of realized net (gains) losses to net income	17	(30)	81	(93)
AOCI Tax, Attributable to Parent, Ending Balance	1,014	1,532	1,014	1,532
Market Value Adjustments for Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI Tax, Attributable to Parent, Beginning Balance	(1)	19	(179)	42
Unrealized gains (losses) arising during the period	(19)	(152)	81	(184)
Reclassifications of realized net (gains) losses to net income	17	6	95	15
AOCI Tax, Attributable to Parent, Ending Balance	(3)	(127)	(3)	(127)
Unrecognized Pension and  Postretirement Medical  Expense
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI Tax, Attributable to Parent, Beginning Balance	885	1,570	901	1,653
Unrealized gains (losses) arising during the period	0	0	(16)	(11)
Reclassifications of realized net (gains) losses to net income	0	(36)	0	(108)
AOCI Tax, Attributable to Parent, Ending Balance	885	1,534	885	1,534
Foreign Currency Translation and Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI Tax, Attributable to Parent, Beginning Balance	123	98	139	89
Unrealized gains (losses) arising during the period	9	27	7	36
Reclassifications of realized net (gains) losses to net income	0	0	(14)	0
AOCI Tax, Attributable to Parent, Ending Balance	$ 132	$ 125	$ 132	$ 125