Borrowing Activity (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Mar. 28, 2015		Sep. 27, 2014
Borrowings [Roll Forward]
Borrowings, balance	$ 14,957		$ 14,840
Borrowings	3,800
Reductions of borrowings	(3,696)
Other Activity	13
Commercial paper with original maturities less than three months (1)
Borrowings [Roll Forward]
Borrowings, balance	1,906	[1]	50	[1]
Borrowings	1,855	[1]
Reductions of borrowings	0	[1]
Other Activity	1	[1]
commercial paper with original maturities greater than three months [Member]
Borrowings [Roll Forward]
Borrowings, balance	100		0
Borrowings	1,822
Reductions of borrowings	(1,723)
Other Activity	1
U.S. medium-term notes
Borrowings [Roll Forward]
Borrowings, balance	11,918		13,713
Borrowings	0
Reductions of borrowings	(1,800)
Other Activity	5
Other Foreign Currency Denominated Debt
Borrowings [Roll Forward]
Borrowings, balance	723		783
Borrowings	123
Reductions of borrowings	(149)
Other Activity	(34)
Other
Borrowings [Roll Forward]
Borrowings, balance	310		294
Borrowings	0
Reductions of borrowings	(24)
Other Activity	$ 40

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