Short-term Borrowings and Long-term Debt Short-term Borrowings and Long-term Debt (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		0 Months Ended
	Apr. 28, 2013	Aug. 06, 2012	Aug. 02, 2012 Floating Rate Notes due August 1, 2014 [Member]	Aug. 02, 2012 Two Point Five Percent Notes due August 2, 2022 [Member]	Aug. 02, 2012 Three Point Eight Percent Notes due August 2, 2042 [Member]
Business Acquisition, Cost of Acquired Entity, Purchase Price		$ 1,550
Business Combination, Initial Purchase Price Adjustment		20
Business Combination, Purchase Price Adjustment	11
Debt Instrument, Face Amount			$ 400	$ 450	$ 400
Debt Instrument, Interest Rate Terms			LIBOR plus 0.3%
Debt Instrument, Interest Rate, Stated Percentage				2.50%	3.80%