Income Taxes (Details) (USD $) In Millions, unless otherwise specified	Dec. 26, 2014	Sep. 26, 2014
2012 Tax Sharing Agreement
Tax Sharing Agreement [Line Items]
Prepaid expenses and other current assets	$ 0	$ 0
Other assets	0	0
Net receivable	0	0
Accrued and other current liabilities	0	0
Other liabilities	(46)	(46)
Tax sharing agreement related liabilities	(46)	(46)
Net liability	(46)	(46)
2007 Tax Sharing Agreement
Tax Sharing Agreement [Line Items]
Prepaid expenses and other current assets	3	3
Other assets	23	23
Net receivable	26	26
Accrued and other current liabilities	(21)	(21)
Other liabilities	(194)	(194)
Tax sharing agreement related liabilities	(215)	(215)
Net liability	$ (189)	$ (189)