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Retirement Benefit Plans , Fair Value Measurement (Details) - Pension benefits - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Apr. 28, 2017 | Apr. 29, 2016 | Apr. 24, 2015
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | $ 1,235 | $ 1,113 |
U.S. Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 2,479 | 2,138 | $ 2,204
Investments Measured at Net Asset Value | 1,426 | 1,187 |
U.S. Pension Benefits | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 306 | 264 |
U.S. Pension Benefits | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 279 | 225 |
U.S. Pension Benefits | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 468 | 462 |
U.S. Pension Benefits | Short-term investments |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 168 | 127 |
U.S. Pension Benefits | Short-term investments | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 168 | 127 |
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 | 167 | 146 |
U.S. Pension Benefits | U.S. government securities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 138 | 137 |
U.S. Pension Benefits | U.S. government securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 29 | 9 |
U.S. Pension Benefits | U.S. government securities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Pension Benefits | Corporate debt securities |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 250 | 216 |
U.S. Pension Benefits | Corporate debt securities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. Pension Benefits | Corporate debt securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 250 | 216 |
U.S. Pension Benefits | Corporate debt securities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 0 | 0 |
Reconciliation of Retirement Benefit Plan Assets Measured at Fair Value Using Significant Unobservable Inputs |  |  |
Beginning balance | 0 | 1 |
Total realized gains included in income |  | 0 |
Total unrealized gains included in accumulated other comprehensive (loss) income |  | (1) |
Purchases and sales, net |  | 0 |
Ending balance |  | 0 |
U.S. Pension Benefits | Equity commingled trusts |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 1,127 | 956 |
Investments Measured at Net Asset Value | 1,127 | 956 |
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 | Fixed income commingled trusts |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 299 | 231 |
Investments Measured at Net Asset Value | 299 | 231 |
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 | Investments | Level 3 |  |  |
Reconciliation of Retirement Benefit Plan Assets Measured at Fair Value Using Significant Unobservable Inputs |  |  |
Beginning balance | 462 | 473 |
Total realized gains included in income | 25 | 10 |
Total unrealized gains included in accumulated other comprehensive (loss) income | 28 | (144) |
Purchases and sales, net | (47) | 123 |
Ending balance | 468 | 462 |
U.S. Pension Benefits | Partnership units |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 468 | 462 |
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 | 468 | 462 |
Reconciliation of Retirement Benefit Plan Assets Measured at Fair Value Using Significant Unobservable Inputs |  |  |
Beginning balance | 462 | 472 |
Total realized gains included in income | 25 | 10 |
Total unrealized gains included in accumulated other comprehensive (loss) income | 28 | (143) |
Purchases and sales, net | (47) | 123 |
Ending balance | 468 | 462 |
Non-U.S. Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 1,235 | 1,113 | $ 1,189
Investments Measured at Net Asset Value | 1,191 | 1,037 |
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 | 44 | 76 |
Non-U.S. Pension Benefits | Investments | Level 3 |  |  |
Reconciliation of Retirement Benefit Plan Assets Measured at Fair Value Using Significant Unobservable Inputs |  |  |
Beginning balance | 76 | 76 |
Total unrealized gains included in accumulated other comprehensive (loss) income | 2 |  |
Purchases and sales, net | (31) | (2) |
Currency exchange rate changes | (3) | 2 |
Ending balance | 44 | 76 |
Non-U.S. Pension Benefits | Partnership units | Level 3 |  |  |
Reconciliation of Retirement Benefit Plan Assets Measured at Fair Value Using Significant Unobservable Inputs |  |  |
Beginning balance | 0 | 16 |
Purchases and sales, net |  | (16) |
Currency exchange rate changes |  | 0 |
Ending balance |  | 0 |
Non-U.S. Pension Benefits | Registered investment companies |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 1,191 | 1,037 |
Investments Measured at Net Asset Value | 1,191 | 1,037 |
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 | Insurance contracts |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |
Fair value of plan assets | 44 | 76 |
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 | 44 | 76 |
Reconciliation of Retirement Benefit Plan Assets Measured at Fair Value Using Significant Unobservable Inputs |  |  |
Beginning balance | 76 | 60 |
Total unrealized gains included in accumulated other comprehensive (loss) income | 2 |  |
Purchases and sales, net | (31) | 14 |
Currency exchange rate changes | (3) | 2 |
Ending balance | $ 44 | $ 76 |

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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