v3.26.1
Equity Changes in Accumulated Other Comprehensive Loss, 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 Tax, Attributable to Parent, Beginning Balance $ 610 $ 567 $ 621 $ 718
Unrealized gains (losses) arising during the period 27 46 29 (60)
Reclassifications of realized net (gains) losses to net income (19) 19 (32) 32
AOCI reclassifications to comprehensive income, tax       (58)
AOCI Tax, Attributable to Parent, Ending Balance 618 632 618 632
Market Value Adjustments for Hedges        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI Tax, Attributable to Parent, Beginning Balance 109 (38) 120 71
Unrealized gains (losses) arising during the period (34) 50 (31) (80)
Reclassifications of realized net (gains) losses to net income (20) 27 (34) 48
AOCI reclassifications to comprehensive income, tax       0
AOCI Tax, Attributable to Parent, Ending Balance 55 39 55 39
Unrecognized Pension and  Postretirement Medical  Expense        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI Tax, Attributable to Parent, Beginning Balance 447 523 446 531
Unrealized gains (losses) arising during the period 0 0 0 0
Reclassifications of realized net (gains) losses to net income 1 (8) 2 (16)
AOCI reclassifications to comprehensive income, tax       0
AOCI Tax, Attributable to Parent, Ending Balance 448 515 448 515
Foreign Currency Translation and Other        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI Tax, Attributable to Parent, Beginning Balance 54 82 55 116
Unrealized gains (losses) arising during the period 61 (4) 60 20
Reclassifications of realized net (gains) losses to net income 0 0 0 0
AOCI reclassifications to comprehensive income, tax       (58)
AOCI Tax, Attributable to Parent, Ending Balance $ 115 $ 78 $ 115 $ 78