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Business Combinations - Fair Values of Net Assets Acquired (Detail) - USD ($) $ in Millions | Jan. 29, 2016 | Apr. 24, 2015
--- | --- | ---
Business Acquisition [Line Items] |  |
Goodwill | $ 1,027 | $ 1,027
Fiscal 2015 Acquisitions |  |
Business Acquisition [Line Items] |  |
Tangible net assets | 14 |
Finite-lived intangible assets | 32 |
Goodwill | 39 |
Total purchase price | $ 85 |

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