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Retirement Plans - Schedule of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Aug. 31, 2023 | Aug. 31, 2022
Pension Plans [Member] | U.S. Plans [Member] |  |
Net Periodic Benefit Cost |  |
Service cost | $ 136 | $ 163
Other retirement plans expense (income): |  |
Interest cost | 341 | 304
Expected return on plan assets | (400) | (422)
Amortization of prior service credit and other | (2) | (2)
Other retirement plans (income) expense | (61) | (120)
Net periodic benefit cost | 75 | 43
Pension Plans [Member] | International Pension Plans [Member] |  |
Net Periodic Benefit Cost |  |
Service cost | 10 | 11
Other retirement plans expense (income): |  |
Interest cost | 10 | 9
Expected return on plan assets | (4) | (4)
Other retirement plans (income) expense | 6 | 5
Net periodic benefit cost | 16 | 16
Postretirement Healthcare Plans [Member] |  |
Net Periodic Benefit Cost |  |
Service cost | 7 | 9
Other retirement plans expense (income): |  |
Interest cost | 16 | 14
Other retirement plans (income) expense | 16 | 14
Net periodic benefit cost | $ 23 | $ 23

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