Equity Changes in Accumulated Other Comprehensive Loss, 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 Tax, Attributable to Parent, Beginning Balance	$ 1,687	$ 2,304	$ 1,784	$ 2,380
Unrealized gains (losses) arising during the period	(125)	(46)	(159)	(39)
Reclassifications of realized net (gains) losses to net income	(30)	(47)	(93)	(130)
AOCI Tax, Attributable to Parent, Ending Balance	1,532	2,211	1,532	2,211
Market Value Adjustments for Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI Tax, Attributable to Parent, Beginning Balance	19	69	42	40
Unrealized gains (losses) arising during the period	(152)	0	(184)	22
Reclassifications of realized net (gains) losses to net income	6	(2)	15	5
AOCI Tax, Attributable to Parent, Ending Balance	(127)	67	(127)	67
Unrecognized Pension and  Postretirement Medical  Expense
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI Tax, Attributable to Parent, Beginning Balance	1,570	2,097	1,653	2,201
Unrealized gains (losses) arising during the period	0	(9)	(11)	(23)
Reclassifications of realized net (gains) losses to net income	(36)	(45)	(108)	(135)
AOCI Tax, Attributable to Parent, Ending Balance	1,534	2,043	1,534	2,043
Foreign Currency Translation and Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI Tax, Attributable to Parent, Beginning Balance	98	138	89	139
Unrealized gains (losses) arising during the period	27	(37)	36	(38)
Reclassifications of realized net (gains) losses to net income	0	0	0	0
AOCI Tax, Attributable to Parent, Ending Balance	$ 125	$ 101	$ 125	$ 101