Discontinued Operations (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Jul. 28, 2013	Apr. 28, 2013	Jan. 27, 2013	Oct. 28, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Deferred Tax Liabilities, Parent's Basis in Discontinued Operation		$ 0	$ 0	$ 0
Segment, Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of Long-Lived Assets to be Disposed of	396
Impairment Of Long Lived Assets To Be Disposed Of, Net Of Tax	263	0	0	0
Impairment Of Long Lived Assets To Be Disposed Of, Per Share Diluted	$ 0.83
Deferred Tax Liabilities, Parent's Basis in Discontinued Operation	$ 18
Deferred Tax Liabilities, Parent's Basis in Discontinued Operation, Per Share Diluted	$ 0.06