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Changes in Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 30, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]    
AOCI, Beginning Balance $ (3,292) $ (4,119)
Unrealized gains (losses) arising during the period (84) (221)
Reclassifications of realized net (gains) losses to net income (126) (138)
AOCI, Ending Balance (3,502) (4,478)
Market Value Adjustments for Hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
AOCI, Beginning Balance 195 625
Unrealized gains (losses) arising during the period (211) (375)
Reclassifications of realized net (gains) losses to net income (108) (167)
AOCI, Ending Balance (124) 83
Unrecognized Pension and  Postretirement Medical  Expense    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
AOCI, Beginning Balance (1,655) (2,869)
Unrealized gains (losses) arising during the period (3) 0
Reclassifications of realized net (gains) losses to net income (18) 1
AOCI, Ending Balance (1,676) (2,868)
Foreign Currency Translation and Other    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
AOCI, Beginning Balance (1,832) (1,875)
Unrealized gains (losses) arising during the period 130 154
Reclassifications of realized net (gains) losses to net income 0 28
AOCI, Ending Balance $ (1,702) $ (1,693)