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Equity Changes in Accumulated Other Comprehensive Loss, Before Tax (Detail) - USD ($)
$ in Millions
12 Months Ended
Oct. 02, 2021
Oct. 03, 2020
Sep. 28, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]      
AOCI before Tax, Attributable to Parent, Beginning Balance $ (10,702) $ (8,459) $ (4,849)
Unrealized gains (losses) arising during the period 1,693 (2,527) (3,680)
Reclassifications of realized net (gains) losses to net income 785 284 93
AOCI reclassifications to retained earnings, before tax     (23)
AOCI before Tax, Attributable to Parent, Ending Balance (8,224) (10,702) (8,459)
Market Value Adjustments for Hedges      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
AOCI before Tax, Attributable to Parent, Beginning Balance (191) 129 201
Unrealized gains (losses) arising during the period 70 (57) 136
Reclassifications of realized net (gains) losses to net income (31) (263) (185)
AOCI reclassifications to retained earnings, before tax     (23)
AOCI before Tax, Attributable to Parent, Ending Balance (152) (191) 129
Unrecognized Pension and Postretirement Medical Expense      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
AOCI before Tax, Attributable to Parent, Beginning Balance (9,423) (7,502) (4,323)
Unrealized gains (losses) arising during the period 1,582 (2,468) (3,457)
Reclassifications of realized net (gains) losses to net income 816 547 278
AOCI reclassifications to retained earnings, before tax     0
AOCI before Tax, Attributable to Parent, Ending Balance (7,025) (9,423) (7,502)
Foreign Currency Translation and Other      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
AOCI before Tax, Attributable to Parent, Beginning Balance (1,088) (1,086) (727)
Unrealized gains (losses) arising during the period 41 (2) (359)
Reclassifications of realized net (gains) losses to net income 0 0 0
AOCI reclassifications to retained earnings, before tax     0
AOCI before Tax, Attributable to Parent, Ending Balance $ (1,047) $ (1,088) $ (1,086)