Equity Changes in Accumulated Other Comprehensive Loss, Tax (Details) - USD ($) $ in Millions	3 Months Ended
Dec. 29, 2018	Dec. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI Tax, Attributable to Parent, Beginning Balance	$ 1,752	$ 1,994
Other Comprehensive Income (Loss) before Reclassifications, Tax	(13)	(29)
Reclassification from AOCI, Current Period, Tax	(7)	(43)
AOCI reclassifications to retained earnings, tax	(683)
AOCI Tax, Attributable to Parent, Ending Balance	1,049	1,922
Investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI Tax, Attributable to Parent, Beginning Balance	(9)	(7)
Other Comprehensive Income (Loss) before Reclassifications, Tax	0	0
Reclassification from AOCI, Current Period, Tax	0	0
AOCI reclassifications to retained earnings, tax	9
AOCI Tax, Attributable to Parent, Ending Balance	0	(7)
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI Tax, Attributable to Parent, Beginning Balance	(32)	46
Other Comprehensive Income (Loss) before Reclassifications, Tax	(6)	(13)
Reclassification from AOCI, Current Period, Tax	9	(8)
AOCI reclassifications to retained earnings, tax	(9)
AOCI Tax, Attributable to Parent, Ending Balance	(38)	25
Unrecognized Pension and Postretirement Medical Expense
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI Tax, Attributable to Parent, Beginning Balance	1,690	1,839
Other Comprehensive Income (Loss) before Reclassifications, Tax	0	0
Reclassification from AOCI, Current Period, Tax	(16)	(35)
AOCI reclassifications to retained earnings, tax	(667)
AOCI Tax, Attributable to Parent, Ending Balance	1,007	1,804
Foreign Currency Translation and Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI Tax, Attributable to Parent, Beginning Balance	103	116
Other Comprehensive Income (Loss) before Reclassifications, Tax	(7)	(16)
Reclassification from AOCI, Current Period, Tax	0	0
AOCI reclassifications to retained earnings, tax	(16)
AOCI Tax, Attributable to Parent, Ending Balance	$ 80	$ 100

AOCI reclassifications to retained earnings, tax

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Amount of tax expense (benefit) allocated to accumulated other comprehensive income (loss) attributable to parent.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss).

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss).

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