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Financial Instruments - Activity Related to the Company's Investment Portfolio and Available-for-sale Debt Securities Contractual Maturities (Details) - USD ($) $ in Millions	3 Months Ended
	Jul. 28, 2017	Jul. 29, 2016
AFS Debt Maturities
Due in one year or less	$ 888
Due after one year through five years	2,681
Due after five years through ten years	3,203
Due after ten years	84
Total	6,856
Debt
AFS Gross Realized Gain (Loss)
Proceeds from sales	971	$ 1,098
Gross realized gains	8	7
Gross realized losses	(3)	(12)
Impairment losses recognized	0	0
Equity
AFS Gross Realized Gain (Loss)
Proceeds from sales	0	6
Gross realized gains	7	4
Gross realized losses	0	0
Impairment losses recognized	$ 0	$ (3)

X

- Definition

Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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