Segment Reporting (Reconciliation of Total Segment Operating Income to Consolidated Earnings Before Income Taxes) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended									12 Months Ended
	Sep. 28, 2014	Jun. 29, 2014	Mar. 30, 2014	Dec. 29, 2013	Sep. 29, 2013		Jun. 30, 2013	Mar. 31, 2013	Dec. 30, 2012	Sep. 28, 2014	Sep. 29, 2013		Sep. 30, 2012
Operating income/(loss)	$ 854.9	$ 768.5	$ 644.1	$ 813.5	$ (2,115.2)	[1]	$ 615.2	$ 544.1	$ 630.6	$ 3,081.1	$ (325.4)	[1]	$ 1,997.4
Interest income and other, net					72.1		3.5	50.8	(2.9)	142.7	123.6		94.4
Interest expense					(9.1)		(6.3)	(6.1)	(6.6)	(64.1)	(28.1)		(32.7)
Earnings/(loss) before income taxes					(2,052.2)		612.4	588.8	621.1	3,159.7	(229.9)		2,059.1
Litigation charge					(2,784.1)		0	0	0	20.2	(2,784.1)		0
Operating Segments [Member]
Operating income/(loss)										3,831.1	3,131.6		2,592.8
Corporate, Non-Segment [Member]
Operating income/(loss)										$ (750.0)	$ (3,457.0)	[2]	$ (595.4)

[1] The fourth quarter of fiscal 2013 includes a pretax charge of $2,784.1 million resulting from the conclusion of the arbitration with Kraft.

[2] Fiscal 2013 includes a pretax charge of $2,784.1 million resulting from the litigation charge we recorded associated with the conclusion of our arbitration with Kraft.