Acquistion Acquistion Schedule of Intangible Assets Acquired As Part of Business Combination (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Oct. 28, 2012	Aug. 06, 2012
Intangible Assets Other Than Goodwill [Line Items]
Intangible assets		$ 580
Minimum [Member]
Intangible Assets Other Than Goodwill [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years
Maximum [Member]
Intangible Assets Other Than Goodwill [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years
Customer Relationships [Member]
Intangible Assets Other Than Goodwill [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets		132
Distribution Rights [Member]
Intangible Assets Other Than Goodwill [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets		2
Patented Technology [Member]
Intangible Assets Other Than Goodwill [Line Items]
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets		43
Patented Technology [Member] | Minimum [Member]
Intangible Assets Other Than Goodwill [Line Items]
Finite-Lived Intangible Asset, Useful Life	9 years
Patented Technology [Member] | Maximum [Member]
Intangible Assets Other Than Goodwill [Line Items]
Finite-Lived Intangible Asset, Useful Life	17 years
Trade Secrets [Member]
Intangible Assets Other Than Goodwill [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets		20
Trademarks [Member]
Intangible Assets Other Than Goodwill [Line Items]
Business Acquisition, Purchase Price Allocation, Intangible Assets Not Amortizable		$ 383