Fair Value Measurements Fair Value Measurements Narrative (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Aug. 02, 2015	Jan. 26, 2014	Jul. 28, 2013	Aug. 02, 2015	Aug. 03, 2014	Jul. 28, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)				$ 6
Asset Impairment Charges		$ 11
Goodwill	$ 2,344		$ 2,297	2,344	$ 2,433	$ 2,297
Cash and Cash Equivalents, at Carrying Value	39			39	46
Long-term Debt	2,552			2,552	2,544
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	39			39	46
Long-term Debt, Fair Value	2,623			2,623	2,647
2014 Initiatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	54			54
Restructuring and Related Cost, Incurred Cost				0	54
2014 Initiatives [Member] | Asset Impairment Accelerated Depreciation [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	12			12
Restructuring and Related Cost, Incurred Cost				0	12
2013 Initiatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	146			146
Restructuring and Related Cost, Incurred Cost				0	4	142
2013 Initiatives [Member] | Asset Impairment Accelerated Depreciation [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	99			99
Restructuring and Related Cost, Incurred Cost				0	0	99
Global Baking And Snacking [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	6
Indefinite-lived Intangible Assets (Excluding Goodwill), Fair Value Disclosure	9			9
Goodwill	732		775	732	918	775
Global Baking And Snacking [Member] | 2014 Initiatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	23			23
Global Baking And Snacking [Member] | 2014 Initiatives [Member] | Asset Impairment Accelerated Depreciation [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	0			0
Global Baking And Snacking [Member] | 2013 Initiatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	14			14
Global Baking And Snacking [Member] | 2013 Initiatives [Member] | Asset Impairment Accelerated Depreciation [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	10			10
International Simple Meals And Beverages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill	96		122	96	$ 115	122
International Simple Meals And Beverages [Member] | 2014 Initiatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	18			18
International Simple Meals And Beverages [Member] | 2014 Initiatives [Member] | Asset Impairment Accelerated Depreciation [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	11			11
International Simple Meals And Beverages [Member] | 2013 Initiatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	9			9
International Simple Meals And Beverages [Member] | 2013 Initiatives [Member] | Asset Impairment Accelerated Depreciation [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring and Related Cost, Cost Incurred to Date	$ 3			$ 3
Discontinued Operations [Member] | International Simple Meals And Beverages [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)			36
Goodwill, Impairment Loss			360
Goodwill			110			110
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property, Plant, and Equipment, Fair Value Disclosure			$ 29			$ 29