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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions		3 Months Ended		9 Months Ended		165 Months Ended
	Feb. 15, 2017	Jan. 27, 2017	Jan. 29, 2016	Jan. 27, 2017	Jan. 29, 2016	Jan. 27, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to equity awards		$ 257,000,000		$ 257,000,000		$ 257,000,000
Unrecognized compensation expense will be amortized on a straight-line basis over a weighted-average remaining period, in years				2 years
Stock repurchase program, authorized amount		$ 9,600,000,000		$ 9,600,000,000		$ 9,600,000,000
Allocation of purchase price of share repurchases				$ 576,000,000
Repurchase of common stock, shares				18		266
Average price of common stock repurchased under repurchase program				$ 31.19		$ 32.74
Aggregate purchase price of common stock authorized under repurchase program				$ 576,000,000	$ 698,000,000	$ 8,700,000,000
Cash dividends declared, per common share		$ 0.190	$ 0.180	$ 0.570	$ 0.540
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash dividends declared, per common share	$ 0.19
Cash dividend payable date	Apr. 26, 2017
Cash dividend record date	Apr. 07, 2017
Additional Paid-in Capital
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocation of purchase price of share repurchases				$ 305,000,000
Retained Earnings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocation of purchase price of share repurchases				$ 271,000,000
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of Common stock issued to settle PBRSUs of target shares granted				0.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of Common stock issued to settle PBRSUs of target shares granted				200.00%
Performance Based Restricted Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs grant date fair value		$ 15,000,000		$ 15,000,000		$ 15,000,000
Performance Based Restricted Stock Unit | PBRSU One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				2 years
Performance Based Restricted Stock Unit | PBRSU Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years

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