Investments , Marketable Securities, Credit Losses on and Maturities of Debt Securities (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Apr. 26, 2013	Apr. 27, 2012
Investment Holdings [Line Items]
Investments	$ 10,211	$ 8,178
Long-term Investments	843	947
Credit Loss Portion of Other-than-temporary Impairments on Debt Securities
Beginning Balance	20	20
Credit losses recognized on securities previously not impaired	0	1
Additional credit losses recognized on securities previously impaired	0	1
Reductions for securities sold during the period	(11)	(2)
Ending Balance	9	20
AFS Debt Maturities
Due in one year or less	2,169
Due after one year through five years	7,040
Due after five years through ten years	978
Due after ten years	113
Total debt securities	10,300
Investments
Investment Holdings [Line Items]
Available-for-sale Securities	10,161	8,132
Trading Securities	50	46
Investments Other than Available-for-sale and Trading Securities	0	0
Other Assets
Investment Holdings [Line Items]
Available-for-sale Securities	294	439
Trading Securities	0	0
Investments Other than Available-for-sale and Trading Securities	$ 549	$ 508

Equity method investments in common stock and investments accounted for under the cost-method that are available.

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