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Stockholders' Equity - Reconciliation of Retained Earnings (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 29, 2016 | Jan. 23, 2015 | Jan. 29, 2016 | Jan. 23, 2015
Retained Earnings Adjustments [Line Items] |  |  |  |
Beginning balance |  |  | $ 53 |
Net income | $ 153 | $ 177 | 237 | $ 425
Repurchases of common stock |  |  | (698) |
Dividends paid |  |  | (159) | (157)
Ending balance | $ 51 |  | 51 |
Retained Earnings |  |  |  |
Retained Earnings Adjustments [Line Items] |  |  |  |
Repurchases of common stock |  |  | (164) |
Dividends paid |  |  | $ (75) | $ (105)

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