v3.24.3
Equity Changes in Accumulated Other Comprehensive Loss, Before Tax (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 28, 2024
Sep. 30, 2023
Oct. 01, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]      
AOCI before Tax, Attributable to Parent, Beginning Balance $ (3,887) $ (4,980) $ (8,224)
Unrealized gains (losses) arising during the period 32 1,491 2,766
Reclassifications of realized net (gains) losses to net income (562) (398) 478
AOCI before Tax, Attributable to Parent, Ending Balance (4,417) (3,887) (4,980)
Market Value Adjustments for Hedges      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
AOCI before Tax, Attributable to Parent, Beginning Balance 259 804 (152)
Unrealized gains (losses) arising during the period (112) (101) 1,098
Reclassifications of realized net (gains) losses to net income (466) (444) (142)
AOCI before Tax, Attributable to Parent, Ending Balance (319) 259 804
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) (7,025)
Unrealized gains (losses) arising during the period 25 1,594 2,635
Reclassifications of realized net (gains) losses to net income (96) 4 620
AOCI before Tax, Attributable to Parent, Ending Balance (2,243) (2,172) (3,770)
Foreign Currency Translation and Other      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
AOCI before Tax, Attributable to Parent, Beginning Balance (1,974) (2,014) (1,047)
Unrealized gains (losses) arising during the period 119 (2) (967)
Reclassifications of realized net (gains) losses to net income 0 42 0
AOCI before Tax, Attributable to Parent, Ending Balance $ (1,855) $ (1,974) $ (2,014)