Restructuring Charges Restructuring Charges (Schedule Of Pre-Tax Charges And Remaining Costs) (Details) (USD $) In Millions, unless otherwise specified	16 Months Ended				31 Months Ended
	Jan. 26, 2014 2013 Initiatives [Member]	Jan. 26, 2014 2013 Initiatives [Member] Severance Pay And Benefits [Member]	Jan. 26, 2014 2013 Initiatives [Member] Asset Impairment Accelerated Depreciation [Member]	Jan. 26, 2014 2013 Initiatives [Member] Other Restructuring [Member]	Jan. 26, 2014 2011 Initiatives [Member]	Jan. 26, 2014 2011 Initiatives [Member] Severance Pay And Benefits [Member]	Jan. 26, 2014 2011 Initiatives [Member] Asset Impairment Accelerated Depreciation [Member]	Jan. 26, 2014 2011 Initiatives [Member] Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	$ 148	$ 35	$ 99	$ 14
Restructuring and Related Cost, Cost Incurred to Date	145	35	99	11	73	41	23	9
Restructuring and Related Cost, Expected Cost Remaining	$ 3	$ 0	$ 0	$ 3