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Retirement Benefit Plans - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 30, 2020 | Oct. 25, 2019 | Oct. 30, 2020 | Oct. 25, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Incremental expense related to acceptance of voluntary early retirement packages | $ 97 |  | $ 97 |
Incremental expense related to acceptance of voluntary early retirement packages, amount related to defined contribution plans | 11 |  | 11 |
Incremental expense related to acceptance of voluntary early retirement packages, amount related to cash payments and administrative fees | 2 |  | 2 |
United States | Pension plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Incremental expense related to acceptance of voluntary early retirement packages, amount related to defined benefit plans | 80 | $ 0 | 80 | $ 0
United States | Post-retirement benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Incremental expense related to acceptance of voluntary early retirement packages, amount related to defined benefit plans | $ 4 |  | $ 4 |

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- Definition Defined Benefit And Contribution Plan, Cash Payments And Administrative Expense Related To Providing Special And Contractual Termination Benefits + References No definition available. + Details
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- Definition Defined Benefit And Contribution Plan, Cost of Providing Special and Contractual Termination Benefits + References No definition available. + Details
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- Definition Defined Contribution Plan, Cost of Providing Special and Contractual Termination Benefits + References No definition available. + Details
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- Definition Amount of cost of providing special or contractual termination benefits payable from defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (q) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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