Borrowing Activity (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 27, 2014		Sep. 27, 2014
Borrowings [Roll Forward]
Borrowings, balance	$ 16,543		$ 14,840
Borrowings	2,816
Reductions of borrowings	(1,105)
Other Activity	(8)
Commercial paper with original maturities less than three months, net (1)
Borrowings [Roll Forward]
Borrowings, balance	1,075	[1]	50	[1]
Borrowings	1,025	[1]
Reductions of borrowings	0	[1]
Other Activity	0	[1]
commercial paper with original maturities greater than three months [Member]
Borrowings [Roll Forward]
Borrowings, balance	1,722		0
Borrowings	1,722
Reductions of borrowings	0
Other Activity	0
U.S. medium-term notes
Borrowings [Roll Forward]
Borrowings, balance	12,716		13,713
Borrowings	0
Reductions of borrowings	(1,000)
Other Activity	3
Other Foreign Currency Denominated Debt
Borrowings [Roll Forward]
Borrowings, balance	740		783
Borrowings	69
Reductions of borrowings	(93)
Other Activity	(19)
Other
Borrowings [Roll Forward]
Borrowings, balance	290		294
Borrowings	0
Reductions of borrowings	(12)
Other Activity	$ 8

[1] Borrowings and reductions of borrowings are reported net.