Equity Changes in Accumulated Other Comprehensive Loss, Tax (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 28, 2024	Dec. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI Tax, Attributable to Parent, Beginning Balance	$ 718	$ 595
Unrealized gains (losses) arising during the period	(106)	59
Reclassifications of realized net (gains) losses to net income	13	38
AOCI reclassifications to comprehensive income, tax	(58)
AOCI Tax, Attributable to Parent, Ending Balance	567	692
Market Value Adjustments for Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI Tax, Attributable to Parent, Beginning Balance	71	(64)
Unrealized gains (losses) arising during the period	(130)	66
Reclassifications of realized net (gains) losses to net income	21	32
AOCI reclassifications to comprehensive income, tax	0
AOCI Tax, Attributable to Parent, Ending Balance	(38)	34
Unrecognized Pension and  Postretirement Medical  Expense
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI Tax, Attributable to Parent, Beginning Balance	531	517
Unrealized gains (losses) arising during the period	0	0
Reclassifications of realized net (gains) losses to net income	(8)	6
AOCI reclassifications to comprehensive income, tax	0
AOCI Tax, Attributable to Parent, Ending Balance	523	523
Foreign Currency Translation and Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI Tax, Attributable to Parent, Beginning Balance	116	142
Unrealized gains (losses) arising during the period	24	(7)
Reclassifications of realized net (gains) losses to net income	0	0
AOCI reclassifications to comprehensive income, tax	(58)
AOCI Tax, Attributable to Parent, Ending Balance	$ 82	$ 135