v3.26.1
Equity Changes in Accumulated Other Comprehensive Loss, Before Tax (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 28, 2026
Mar. 29, 2025
Mar. 28, 2026
Mar. 29, 2025
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI before Tax, Attributable to Parent, Beginning Balance $ (3,510) $ (3,255) $ (3,535) $ (4,417)
Unrealized gains (losses) arising during the period (141) (170) (175) 143
Reclassifications of realized net (gains) losses to net income 82 (84) 141 (139)
AOCI reclassifications to comprehensive income, before tax       904
AOCI before Tax, Attributable to Parent, Ending Balance (3,569) (3,509) (3,569) (3,509)
Market Value Adjustments for Hedges        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI before Tax, Attributable to Parent, Beginning Balance (507) 152 (549) (319)
Unrealized gains (losses) arising during the period 145 (213) 124 346
Reclassifications of realized net (gains) losses to net income 86 (117) 149 (205)
AOCI reclassifications to comprehensive income, before tax       0
AOCI before Tax, Attributable to Parent, Ending Balance (276) (178) (276) (178)
Unrecognized Pension and  Postretirement Medical  Expense        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI before Tax, Attributable to Parent, Beginning Balance (1,905) (2,210) (1,901) (2,243)
Unrealized gains (losses) arising during the period 8 (7) 8 (7)
Reclassifications of realized net (gains) losses to net income (4) 33 (8) 66
AOCI reclassifications to comprehensive income, before tax       0
AOCI before Tax, Attributable to Parent, Ending Balance (1,901) (2,184) (1,901) (2,184)
Foreign Currency Translation and Other        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI before Tax, Attributable to Parent, Beginning Balance (1,098) (1,197) (1,085) (1,855)
Unrealized gains (losses) arising during the period (294) 50 (307) (196)
Reclassifications of realized net (gains) losses to net income 0 0 0 0
AOCI reclassifications to comprehensive income, before tax       904
AOCI before Tax, Attributable to Parent, Ending Balance $ (1,392) $ (1,147) $ (1,392) $ (1,147)