Changes in Accumulated Other Comprehensive Loss, Net of 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, Beginning Balance	$ (4,389)	$ (6,312)	$ (4,119)	$ (6,440)
Unrealized gains (losses) arising during the period	31	72	(13)	(8)
Reclassifications of realized net (gains) losses to net income	(55)	98	(281)	306
AOCI, Ending Balance	(4,413)	(6,142)	(4,413)	(6,142)
Market Value Adjustments for Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	1	(32)	625	(110)
Unrealized gains (losses) arising during the period	66	449	(302)	557
Reclassifications of realized net (gains) losses to net income	(56)	(21)	(312)	(51)
AOCI, Ending Balance	11	396	11	396
Unrecognized Pension and  Postretirement Medical  Expense
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	(2,812)	(5,098)	(2,869)	(5,372)
Unrealized gains (losses) arising during the period	0	0	55	36
Reclassifications of realized net (gains) losses to net income	1	119	3	357
AOCI, Ending Balance	(2,811)	(4,979)	(2,811)	(4,979)
Foreign Currency Translation and Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	(1,578)	(1,182)	(1,875)	(958)
Unrealized gains (losses) arising during the period	(35)	(377)	234	(601)
Reclassifications of realized net (gains) losses to net income	0	0	28	0
AOCI, Ending Balance	$ (1,613)	$ (1,559)	$ (1,613)	$ (1,559)