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Stock-Based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended
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Jul. 28, 2017 | Jul. 29, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation expense | $ 92 | $ 79
Income tax benefits | (25) | (21)
Total stock-based compensation expense, net of tax | 67 | 58
Cost of products sold |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation expense | 10 | 11
Research and development expense |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation expense | 9 | 9
Selling, general, and administrative expense |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation expense | 55 | 51
Restructuring charges |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation expense | 0 | 1
Acquisition-related items |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation expense | 2 | 7
Divestiture-related items |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation expense | 16 | 0
Stock options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation expense | 35 | 38
Restricted stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation expense | 48 | 34
Employee stock purchase plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation expense | $ 9 | $ 7

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