Investments, Marketable Securities, Credit Losses on and Maturities of Debt Securities (Details) - USD ($) $ in Millions	3 Months Ended
	Jul. 31, 2015	Apr. 24, 2015
Long-term
Investments	$ 15,003	$ 14,637
Long-term investments	661	706
AFS Debt Maturities
Due in one year or less	2,165
Due after one year through five years	6,559
Due after five years through ten years	3,191
Due after ten years	191
Total debt securities	12,106
Investments
Long-term
Available-for-sale securities, fair value	14,924	14,560
Trading securities, fair value	79	77
Investments Other than Available-for-sale and Trading Securities	0	0
Other Assets
Long-term
Available-for-sale securities, fair value	164	186
Trading securities, fair value	0	0
Investments Other than Available-for-sale and Trading Securities	497	520
Available for Sale Securities
Long-term
Available-for-sale securities, fair value	61	$ 80
Other Expense, Net
AFS Debt Maturities
Impairment charges, marketable equity investments	$ 20