Changes in Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2016	Jan. 02, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance		$ (3,979)	$ (2,421)
Unrealized gains (losses) arising during the period		100	(24)
Reclassifications of realized net (gains) losses to net income		24	(24)
AOCI, Ending Balance		(3,855)	(2,469)
Investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance		26	13
Unrealized gains (losses) arising during the period		(11)	(3)
Reclassifications of realized net (gains) losses to net income		0	0
AOCI, Ending Balance		15	10
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance		(25)	334
Unrealized gains (losses) arising during the period		324	41
Reclassifications of realized net (gains) losses to net income		(44)	(66)
AOCI, Ending Balance		255	309
Unrecognized Pension and Postretirement Medical Expense
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance		(3,651)	(2,497)
Unrealized gains (losses) arising during the period		(22)	0
Reclassifications of realized net (gains) losses to net income		68	42
AOCI, Ending Balance		(3,605)	(2,455)
Foreign Currency Translation and Other(1)
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	[1]	(329)	(271)
Unrealized gains (losses) arising during the period	[1]	(191)	(62)
Reclassifications of realized net (gains) losses to net income	[1]	0	0
AOCI, Ending Balance	[1]	$ (520)	$ (333)

[1] Foreign Currency Translation and Other is net of an average 22% estimated tax at December 31, 2016 as the Company has not recognized deferred tax assets for some of our foreign entities.