Changes in Accumulated Other Comprehensive Loss, Net of 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, Beginning Balance	$ (4,478)	$ (6,276)	$ (4,119)	$ (6,440)
Unrealized gains (losses) arising during the period	177	(139)	(44)	(80)
Reclassifications of realized net (gains) losses to net income	(88)	103	(226)	208
AOCI, Ending Balance	(4,389)	(6,312)	(4,389)	(6,312)
Market Value Adjustments for Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	83	(60)	625	(110)
Unrealized gains (losses) arising during the period	7	44	(368)	108
Reclassifications of realized net (gains) losses to net income	(89)	(16)	(256)	(30)
AOCI, Ending Balance	1	(32)	1	(32)
Unrecognized Pension and  Postretirement Medical  Expense
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	(2,868)	(5,217)	(2,869)	(5,372)
Unrealized gains (losses) arising during the period	55	0	55	36
Reclassifications of realized net (gains) losses to net income	1	119	2	238
AOCI, Ending Balance	(2,812)	(5,098)	(2,812)	(5,098)
Foreign Currency Translation and Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	(1,693)	(999)	(1,875)	(958)
Unrealized gains (losses) arising during the period	115	(183)	269	(224)
Reclassifications of realized net (gains) losses to net income	0	0	28	0
AOCI, Ending Balance	$ (1,578)	$ (1,182)	$ (1,578)	$ (1,182)