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Retirement Plans - Schedule of Expected Future Benefit Payments (Details) $ in Millions | May 31, 2019 USD ($)
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Pension Plans [Member] | U.S. Plans [Member] |
Defined Benefit Plan Disclosure [Line Items] |
2020 | $ 1,027
2021 | 971
2022 | 1,051
2023 | 1,138
2024 | 1,230
2025-2029 | 7,515
Pension Plans [Member] | International Pension Plans [Member] |
Defined Benefit Plan Disclosure [Line Items] |
2020 | 45
2021 | 46
2022 | 47
2023 | 55
2024 | 61
2025-2029 | 396
Postretirement Healthcare Plans [Member] |
Defined Benefit Plan Disclosure [Line Items] |
2020 | 87
2021 | 98
2022 | 109
2023 | 117
2024 | 121
2025-2029 | $ 473

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