Special Charges and Certain Litigation Charges, Net Special Charges (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 24, 2014	Oct. 25, 2013	Oct. 24, 2014	Oct. 25, 2013
Special Charges [Abstract]
Special Charges	$ 100	$ 0	$ 100	$ 40