Equity Changes in Accumulated Other Comprehensive Loss, Before Tax (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 02, 2022	Apr. 03, 2021	Apr. 02, 2022	Apr. 03, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI before Tax, Attributable to Parent, Beginning Balance	$ (7,990)	$ (10,523)	$ (8,224)	$ (10,702)
Unrealized gains (losses) arising during the period	(143)	102	(46)	130
Reclassifications of realized net (gains) losses to net income	134	199	271	350
AOCI before Tax, Attributable to Parent, Ending Balance	(7,999)	(10,222)	(7,999)	(10,222)
Market Value Adjustments for Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI before Tax, Attributable to Parent, Beginning Balance	(83)	(419)	(152)	(191)
Unrealized gains (losses) arising during the period	53	131	140	(54)
Reclassifications of realized net (gains) losses to net income	(21)	5	(39)	(38)
AOCI before Tax, Attributable to Parent, Ending Balance	(51)	(283)	(51)	(283)
Unrecognized Pension and  Postretirement Medical  Expense
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI before Tax, Attributable to Parent, Beginning Balance	(6,823)	(9,227)	(7,025)	(9,423)
Unrealized gains (losses) arising during the period	0	55	47	57
Reclassifications of realized net (gains) losses to net income	155	194	310	388
AOCI before Tax, Attributable to Parent, Ending Balance	(6,668)	(8,978)	(6,668)	(8,978)
Foreign Currency Translation and Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI before Tax, Attributable to Parent, Beginning Balance	(1,084)	(877)	(1,047)	(1,088)
Unrealized gains (losses) arising during the period	(196)	(84)	(233)	127
Reclassifications of realized net (gains) losses to net income	0	0	0	0
AOCI before Tax, Attributable to Parent, Ending Balance	$ (1,280)	$ (961)	$ (1,280)	$ (961)