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Equity Changes in Accumulated Other Comprehensive Loss, Tax (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 30, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]    
AOCI Tax, Attributable to Parent, Beginning Balance $ 595 $ 861
Unrealized gains (losses) arising during the period 59 108
Reclassifications of realized net (gains) losses to net income 38 37
AOCI Tax, Attributable to Parent, Ending Balance 692 1,006
Market Value Adjustments for Hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
AOCI Tax, Attributable to Parent, Beginning Balance (64) (179)
Unrealized gains (losses) arising during the period 66 100
Reclassifications of realized net (gains) losses to net income 32 51
AOCI Tax, Attributable to Parent, Ending Balance 34 (28)
Unrecognized Pension and  Postretirement Medical  Expense    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
AOCI Tax, Attributable to Parent, Beginning Balance 517 901
Unrealized gains (losses) arising during the period 0 0
Reclassifications of realized net (gains) losses to net income 6 0
AOCI Tax, Attributable to Parent, Ending Balance 523 901
Foreign Currency Translation and Other    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
AOCI Tax, Attributable to Parent, Beginning Balance 142 139
Unrealized gains (losses) arising during the period (7) 8
Reclassifications of realized net (gains) losses to net income 0 (14)
AOCI Tax, Attributable to Parent, Ending Balance $ 135 $ 133