Comprehensive Income and Accumulated Other Comprehensive Loss (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Oct. 28, 2011	Jul. 29, 2011	Oct. 29, 2010	Oct. 28, 2011	Oct. 29, 2010	Apr. 29, 2011
Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Loss) Disclosure [Abstract]
Comprehensive income	$ 799		$ 522	$ 1,759	$ 1,306
AOCI
Unrealized Gain/(Loss) on Investments	244	301		244		196
Cumulative Translation Adjustments	360	457		360		443
Net Change in Retirement Obligations	(584)	(599)		(584)		(607)
Unrealized Gain/(Loss) on Foreign Currency Exchange Rate Derivatives	(177)	(244)		(177)		(257)
Accumulated Other Comprehensive Loss	(157)	(85)		(157)		(224)
Other Comprehensive Income (Loss)
Unrealized Gain/(Loss) on Investments	(57)	105
Cumulative Translation Adjustments	(97)	14
Net Change in Retirement Obligations	15	8
Unrealized Gain/(Loss) on Foreign Currency Exchange Rate Derivatives	67	13
Other Comprehensive Income (Loss)	(72)	139
Other Comprehensive Income (Loss), Tax
Tax expense on the unrealized gain on foreign exchange rate derivatives	42			48
Tax expense related to the net change in retirement obligations	6			12
Tax expense on the unrealized gain on investments	$ 28			$ 28