Shareholders' Equity (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended						4 Months Ended		12 Months Ended
	Sep. 28, 2014	Jul. 06, 2014	Apr. 13, 2014	Sep. 29, 2013	Jul. 07, 2013	Apr. 14, 2013	Jan. 19, 2014	Jan. 20, 2013	Sep. 28, 2014	Sep. 29, 2013	Sep. 30, 2012
Stockholders' Equity Note, Stock Split, Conversion Ratio										2
Dividends Per Common Share [Abstract]
Dividends declared per common share (in dollars per share)	$ 0.12	$ 0.12	$ 0.12	$ 0.10	$ 0.10	$ 0.10	$ 0.12	$ 1.10	$ 0.48	$ 1.40	$ 0.28
Dividends, Common Stock, Cash									$ 176	$ 519	$ 103
Dividend Declared [Member]
Dividends Per Common Share [Abstract]
Dividends Payable, Date Declared	Sep. 11, 2014	Jun. 12, 2014	Feb. 24, 2014	Sep. 10, 2013	Jun. 12, 2013	Mar. 15, 2013	Nov. 01, 2013	Nov. 07, 2012
Dividends declared per common share (in dollars per share)	$ 0.12	$ 0.12	$ 0.12	$ 0.10	$ 0.10	$ 0.10	$ 0.12	$ 0.10
Dividends Payable, Date of Record	Sep. 26, 2014	Jul. 03, 2014	Apr. 11, 2014	Sep. 27, 2013	Jul. 05, 2013	Apr. 12, 2013	Jan. 17, 2014	Jan. 18, 2013
Dividends Payable, Date to be Paid	Oct. 07, 2014	Jul. 15, 2014	Apr. 22, 2014	Oct. 08, 2013	Jul. 16, 2013	Apr. 23, 2013	Jan. 28, 2014	Jan. 29, 2013
Dividends, Common Stock, Cash	43	44	44	37	37	37	45	37
Special Dividend [Member]
Dividends Per Common Share [Abstract]
Dividends Payable, Date Declared								Nov. 29, 2012
Dividends declared per common share (in dollars per share)								$ 1.00
Dividends Payable, Date of Record								Dec. 10, 2012
Dividends Payable, Date to be Paid								Dec. 21, 2012
Dividends, Common Stock, Cash								$ 371