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Equity Changes in Accumulated Other Comprehensive Loss, Before Tax (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 30, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]    
AOCI before Tax, Attributable to Parent, Beginning Balance $ (3,887) $ (4,980)
Unrealized gains (losses) arising during the period (143) (329)
Reclassifications of realized net (gains) losses to net income (164) (175)
AOCI before Tax, Attributable to Parent, Ending Balance (4,194) (5,484)
Market Value Adjustments for Hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
AOCI before Tax, Attributable to Parent, Beginning Balance 259 804
Unrealized gains (losses) arising during the period (277) (475)
Reclassifications of realized net (gains) losses to net income (140) (218)
AOCI before Tax, Attributable to Parent, Ending Balance (158) 111
Unrecognized Pension and  Postretirement Medical  Expense    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
AOCI before Tax, Attributable to Parent, Beginning Balance (2,172) (3,770)
Unrealized gains (losses) arising during the period (3) 0
Reclassifications of realized net (gains) losses to net income (24) 1
AOCI before Tax, Attributable to Parent, Ending Balance (2,199) (3,769)
Foreign Currency Translation and Other    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
AOCI before Tax, Attributable to Parent, Beginning Balance (1,974) (2,014)
Unrealized gains (losses) arising during the period 137 146
Reclassifications of realized net (gains) losses to net income 0 42
AOCI before Tax, Attributable to Parent, Ending Balance $ (1,837) $ (1,826)