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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Jan. 29, 2016 | Apr. 24, 2015
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Statement of Financial Position [Abstract] |  |
Allowances for accounts receivable | $ 164 | $ 144
Ordinary shares, par value (usd per share) | $ 0.0001 | $ 0.0001

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