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RETIREMENT PLANS - Schedule of Net Periodic Benefit (Income) Cost (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2025 | May 31, 2024 | May 31, 2023
Pension Plan | U.S. Pension Plans |  |  |
Net Periodic Benefit Cost |  |  |
Service cost | $ 499 | $ 544 | $ 651
Interest cost | 1,447 | 1,362 | 1,218
Expected return on plan assets | (1,721) | (1,598) | (1,688)
Amortization of prior service credit | (8) | (7) | (7)
Actuarial losses (gains) and other | (521) | (590) | (487)
Net periodic benefit (income) cost | (304) | (289) | (313)
Pension Plan | International Pension Plans |  |  |
Net Periodic Benefit Cost |  |  |
Service cost | 38 | 38 | 44
Interest cost | 43 | 42 | 34
Expected return on plan assets | (21) | (18) | (14)
Amortization of prior service credit | 1 | 0 | (2)
Actuarial losses (gains) and other | 4 | 13 | (25)
Net periodic benefit (income) cost | 65 | 75 | 37
Postretirement Healthcare Plans |  |  |
Net Periodic Benefit Cost |  |  |
Service cost | 26 | 27 | 37
Interest cost | 65 | 61 | 55
Expected return on plan assets | 0 | 0 | 0
Amortization of prior service credit | (4) | (3) | 0
Actuarial losses (gains) and other | 2 | 16 | (138)
Net periodic benefit (income) cost | $ 89 | $ 101 | $ (46)

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