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Equity Changes in Accumulated Other Comprehensive Loss, Before Tax (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jul. 03, 2021
Jun. 27, 2020
Jul. 03, 2021
Jun. 27, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI before Tax, Attributable to Parent, Beginning Balance $ (10,222) $ (8,478) $ (10,702) $ (8,459)
Other Comprehensive Income (Loss), before Reclassifications, before Tax (24) (70) 106 (264)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 198 54 548 229
AOCI before Tax, Attributable to Parent, Ending Balance (10,048) (8,494) (10,048) (8,494)
Market Value Adjustments for Hedges        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI before Tax, Attributable to Parent, Beginning Balance (283) 158 (191) 129
Other Comprehensive Income (Loss), before Reclassifications, before Tax (1) (87) (55) 44
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 4 (78) (34) (180)
AOCI before Tax, Attributable to Parent, Ending Balance (280) (7) (280) (7)
Unrecognized Pension and  Postretirement Medical  Expense        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI before Tax, Attributable to Parent, Beginning Balance (8,978) (7,268) (9,423) (7,502)
Other Comprehensive Income (Loss), before Reclassifications, before Tax 29 (6) 86 (49)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 194 132 582 409
AOCI before Tax, Attributable to Parent, Ending Balance (8,755) (7,142) (8,755) (7,142)
Foreign Currency Translation and Other        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI before Tax, Attributable to Parent, Beginning Balance (961) (1,368) (1,088) (1,086)
Other Comprehensive Income (Loss), before Reclassifications, before Tax (52) 23 75 (259)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 0 0 0 0
AOCI before Tax, Attributable to Parent, Ending Balance $ (1,013) $ (1,345) $ (1,013) $ (1,345)