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Income Taxes - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Apr. 24, 2020 | Apr. 26, 2019 | Apr. 27, 2018 | Apr. 28, 2017
Operating Loss Carryforwards [Line Items] |  |  |  |
Undistributed earnings from non-U.S. subsidiaries | $ 69,900 | $ 64,100 |  |
Tax credit carryforward | 200 |  |  |
Tax credit carryforward, no expiration | 96 |  |  |
Valuation allowance | 5,482 | 6,300 |  |
Income tax settlements and adjustments | (1,200) | (40) | $ 1,900 |
Net benefit associated with finalization of certain impacts from U.S. Tax Reform | 63 | 30 |  |
Benefit related to tax legislative changes in Switzerland | 252 |  |  |
Benefit related to release of valuation allowance | 658 |  |  |
Tax benefit from intercompany sale of intellectual property | 269 |  | 579 |
Charge related to recognition of prepaid tax expense |  | 42 |  |
Benefit related to intercompany legal entity restructuring |  | 32 |  |
Tax benefit related to tax effect from divestiture |  | 20 |  |
Net charge associated with U.S. tax reform |  |  | 2,400 |
Charge associated with internal reorganization of certain foreign subsidiaries |  |  | 73 |
Tax reductions from tax holiday | 231 | 437 | 446 |
Gross unrecognized tax benefits | 1,862 | 1,836 | 1,727 | $ 1,896
Unrecognized tax benefits that would impact effective tax rate | 1,800 | 1,800 | 1,700 |
Gross unrecognized tax benefits, net of cash advance, noncurrent liability | 911 |  |  |
Estimated reasonably possible decrease in uncertain tax positions excluding interest over the next 12 months | 115 |  |  |
Accrued income tax penalties and interest | 225 | 172 | 128 |
Gross interest expense | $ 53 | $ 48 | 84 |
Amortizable Asset Created for Swiss Federal Income Tax Purposes |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Period over which amortization asset will be amortized and deducted | 10 years |  |  |
Internal Revenue Service (IRS) | 2005 through 2014 |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Advance payment in connection with certain tax matters |  |  | 1,100 |
Tax resolutions |  |  | 859 |
Interest |  |  | $ 285 |
Non-U.S. Tax Authorities |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforwards | $ 25,100 |  |  |
Net operating loss carryforwards, no expiration | 22,100 |  |  |
Net operating loss carryforwards, expiring in future years | 3,000 |  |  |
Net operating loss carryforwards, valuation allowance | $ 7,600 |  |  |
Impact on diluted earnings per share (in dollars per share) | $ 0.17 | $ 0.32 | $ 0.33 |
Non-U.S. Tax Authorities | Subsidiaries |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforwards | $ 17,500 |  |  |
U.S. Tax Authority |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforwards | 524 |  |  |
Net operating loss carryforwards, no expiration | 102 |  |  |
State and Local Tax Authorities |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforwards, expiring in future years | $ 1,400 |  |  |

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