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Retirement Benefit Plans - Fair Value Measurement (Details) - Pension benefits - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Apr. 24, 2020 | Apr. 26, 2019 | Apr. 27, 2018
U.S. Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | $ 2,982 | $ 2,728 | $ 2,661
U.S. Pension Benefits | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 548 | 289 |
U.S. Pension Benefits | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 0 | 144 |
U.S. Pension Benefits | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 625 | 629 |
U.S. Pension Benefits | Level 3 | Partnership units |  |  |
Reconciliation of Retirement Benefit Plan Assets Measured at Fair Value Using Significant Unobservable Inputs |  |  |
Beginning balance | 629 | 537 |
Total realized losses |  | (1) |
Total unrealized gains | (45) | 52 |
Purchases and sales, net | 41 | 41 |
Ending balance | 625 | 629 |
U.S. Pension Benefits | Investments measured at net asset value |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 1,809 | 1,666 |
U.S. Pension Benefits | Short-term investments |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 548 | 61 |
U.S. Pension Benefits | Short-term investments | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 548 | 61 |
U.S. Pension Benefits | Short-term investments | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Pension Benefits | Short-term investments | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Pension Benefits | U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets |  | 228 |
U.S. Pension Benefits | U.S. government securities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets |  | 228 |
U.S. Pension Benefits | U.S. government securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets |  | 0 |
U.S. Pension Benefits | U.S. government securities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets |  | 0 |
U.S. Pension Benefits | Corporate debt securities |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets |  | 144 |
U.S. Pension Benefits | Corporate debt securities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets |  | 0 |
U.S. Pension Benefits | Corporate debt securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets |  | 144 |
U.S. Pension Benefits | Corporate debt securities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets |  | 0 |
U.S. Pension Benefits | Equity commingled trusts |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 1,204 | 1,365 |
U.S. Pension Benefits | Equity commingled trusts | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Pension Benefits | Equity commingled trusts | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Pension Benefits | Equity commingled trusts | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Pension Benefits | Equity commingled trusts | Investments measured at net asset value |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 1,204 | 1,365 |
U.S. Pension Benefits | Fixed income commingled trusts |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 605 | 301 |
U.S. Pension Benefits | Fixed income commingled trusts | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Pension Benefits | Fixed income commingled trusts | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Pension Benefits | Fixed income commingled trusts | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Pension Benefits | Fixed income commingled trusts | Investments measured at net asset value |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 605 | 301 |
U.S. Pension Benefits | Partnership units |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 625 | 629 |
U.S. Pension Benefits | Partnership units | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Pension Benefits | Partnership units | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Pension Benefits | Partnership units | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 625 | 629 |
Non-U.S. Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 1,404 | 1,409 | $ 1,404
Non-U.S. Pension Benefits | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Pension Benefits | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Pension Benefits | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 43 | 41 |
Non-U.S. Pension Benefits | Level 3 | Insurance contracts |  |  |
Reconciliation of Retirement Benefit Plan Assets Measured at Fair Value Using Significant Unobservable Inputs |  |  |
Beginning balance | 41 | 42 |
Total unrealized gains | 2 | 1 |
Purchases and sales, net | 1 | 1 |
Currency exchange rate changes | (1) | (3) |
Ending balance | 43 | 41 |
Non-U.S. Pension Benefits | Investments measured at net asset value |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 1,361 | 1,368 |
Non-U.S. Pension Benefits | Registered investment companies |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 1,361 | 1,368 |
Non-U.S. Pension Benefits | Registered investment companies | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Pension Benefits | Registered investment companies | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Pension Benefits | Registered investment companies | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Pension Benefits | Registered investment companies | Investments measured at net asset value |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 1,361 | 1,368 |
Non-U.S. Pension Benefits | Insurance contracts |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 43 | 41 |
Non-U.S. Pension Benefits | Insurance contracts | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Pension Benefits | Insurance contracts | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 0 | 0 |
Non-U.S. Pension Benefits | Insurance contracts | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | $ 43 | $ 41 |

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