Accounting Policies Share Repurchases (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2014	Mar. 29, 2014	Mar. 30, 2013	Mar. 29, 2014	Mar. 30, 2013
Accounting Policies [Line Items]
Payments for Repurchase of Common Stock				$ 275	$ 188
Class A [Member]
Accounting Policies [Line Items]
Payments for Repurchase of Common Stock		116	73	275	188
Treasury Stock, Shares, Acquired		2.9	3.2	7.8	9.1
Share Repurchase Program [Member] | Class A [Member]
Accounting Policies [Line Items]
Payments for Repurchase of Common Stock		100	50	250	150
Treasury Stock, Shares, Acquired		2.5	2.1	7.1	7.2
Remaining shares available to repurchase		32.1		32.1
Increase in authorized shares to repurchase	25
Open market repurchases to fund certain obligations under equity compensation plans [Member] | Class A [Member]
Accounting Policies [Line Items]
Payments for Repurchase of Common Stock		$ 16	$ 23	$ 25	$ 38
Treasury Stock, Shares, Acquired		0.4	1.1	0.7	1.9