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Acquisitions - Fair Value Measurement, Contingent Consideration, Significant Unobservable Inputs (Details) $ in Millions | Oct. 30, 2020 USD ($) | Jul. 31, 2020 USD ($) | Apr. 24, 2020 USD ($) | Oct. 25, 2019 USD ($) | Jul. 26, 2019 USD ($) | Apr. 26, 2019 USD ($)
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Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |  |  |  |  |
Contingent consideration, fair value | $ 461 | $ 297 | $ 280 | $ 260 | $ 269 | $ 222
Revenue and other performance-based payments | Recurring | Level 3 |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |  |  |  |  |
Contingent consideration, fair value | $ 203 |  |  |  |  |
Revenue and other performance-based payments | Minimum | Recurring | Level 3 | Discount rate |  |  |  |  |  |
Fair Value Inputs |  |  |  |  |  |
Contingent consideration, significant unobservable inputs | 0.140 |  |  |  |  |
Revenue and other performance-based payments | Minimum | Recurring | Level 3 | Probability of payment |  |  |  |  |  |
Fair Value Inputs |  |  |  |  |  |
Contingent consideration, significant unobservable inputs | 0.40 |  |  |  |  |
Revenue and other performance-based payments | Maximum | Recurring | Level 3 | Discount rate |  |  |  |  |  |
Fair Value Inputs |  |  |  |  |  |
Contingent consideration, significant unobservable inputs | 0.324 |  |  |  |  |
Revenue and other performance-based payments | Maximum | Recurring | Level 3 | Probability of payment |  |  |  |  |  |
Fair Value Inputs |  |  |  |  |  |
Contingent consideration, significant unobservable inputs | 1 |  |  |  |  |
Revenue and other performance-based payments | Weighted Average | Recurring | Level 3 | Discount rate |  |  |  |  |  |
Fair Value Inputs |  |  |  |  |  |
Contingent consideration, significant unobservable inputs | 0.207 |  |  |  |  |
Revenue and other performance-based payments | Weighted Average | Recurring | Level 3 | Probability of payment |  |  |  |  |  |
Fair Value Inputs |  |  |  |  |  |
Contingent consideration, significant unobservable inputs | 0.994 |  |  |  |  |
Product development and other milestone-based payments | Recurring | Level 3 |  |  |  |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |  |  |  |  |
Contingent consideration, fair value | $ 258 |  |  |  |  |
Product development and other milestone-based payments | Recurring | Level 3 | Discount rate |  |  |  |  |  |
Fair Value Inputs |  |  |  |  |  |
Contingent consideration, significant unobservable inputs | 0.055 |  |  |  |  |
Product development and other milestone-based payments | Minimum | Recurring | Level 3 | Probability of payment |  |  |  |  |  |
Fair Value Inputs |  |  |  |  |  |
Contingent consideration, significant unobservable inputs | 0.50 |  |  |  |  |
Product development and other milestone-based payments | Maximum | Recurring | Level 3 | Probability of payment |  |  |  |  |  |
Fair Value Inputs |  |  |  |  |  |
Contingent consideration, significant unobservable inputs | 1 |  |  |  |  |
Product development and other milestone-based payments | Weighted Average | Recurring | Level 3 | Discount rate |  |  |  |  |  |
Fair Value Inputs |  |  |  |  |  |
Contingent consideration, significant unobservable inputs | 0.055 |  |  |  |  |
Product development and other milestone-based payments | Weighted Average | Recurring | Level 3 | Probability of payment |  |  |  |  |  |
Fair Value Inputs |  |  |  |  |  |
Contingent consideration, significant unobservable inputs | 0.932 |  |  |  |  |

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