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Retirement Plans - Schedule of Retirement Plan Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Feb. 29, 2020 | Feb. 28, 2019 | Feb. 29, 2020 | Feb. 28, 2019
Pension And Other Postretirement Benefit Expense [Abstract] |  |  |  |
Defined benefit pension plans, net | $ 38 | $ 28 | $ 112 | $ 85
Defined contribution plans | 147 | 138 | 425 | 415
Postretirement healthcare plans | 21 | 19 | 64 | 56
Retirement plans costs | $ 206 | $ 185 | $ 601 | $ 556

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- Definition The total amount of net periodic benefit cost for pension plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain or loss, prior service cost or credit, transition asset or obligation, and gain or loss due to settlements or curtailments. + References No definition available. + Details
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- Definition The total amount of net periodic benefit cost for defined benefit postretirement healthcare plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain or loss, prior service cost or credit, transition asset or obligation, and gain or loss due to settlements or curtailments. + References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Amount of cost (reversal of cost) for pension and other postretirement benefits. + References No definition available. + Details
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- References No definition available. + Details
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