Changes in Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 02, 2022	Jul. 03, 2021	Jul. 02, 2022	Jul. 03, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	$ (6,312)	$ (7,918)	$ (6,440)	$ (8,322)
Unrealized gains (losses) arising during the period	72	(70)	(8)	67
Reclassifications of realized net (gains) losses to net income	98	151	306	418
AOCI, Ending Balance	(6,142)	(7,837)	(6,142)	(7,837)
Market Value Adjustments for Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	(32)	(214)	(110)	(151)
Unrealized gains (losses) arising during the period	449	(1)	557	(33)
Reclassifications of realized net (gains) losses to net income	(21)	2	(51)	(29)
AOCI, Ending Balance	396	(213)	396	(213)
Unrecognized Pension and  Postretirement Medical  Expense
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	(5,098)	(6,881)	(5,372)	(7,222)
Unrealized gains (losses) arising during the period	0	20	36	63
Reclassifications of realized net (gains) losses to net income	119	149	357	447
AOCI, Ending Balance	(4,979)	(6,712)	(4,979)	(6,712)
Foreign Currency Translation and Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	(1,182)	(823)	(958)	(949)
Unrealized gains (losses) arising during the period	(377)	(89)	(601)	37
Reclassifications of realized net (gains) losses to net income	0	0	0	0
AOCI, Ending Balance	$ (1,559)	$ (912)	$ (1,559)	$ (912)