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Retirement Plans - Schedule of Expected Future Benefit Payments (Details)
$ in Millions
May 31, 2021
USD ($)
Pension Plans [Member] | U.S. Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2022 $ 1,178
2023 1,246
2024 1,333
2025 1,417
2026 1,505
2027-2031 8,661
Pension Plans [Member] | International Pension Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2022 55
2023 57
2024 60
2025 65
2026 73
2027-2031 487
Postretirement Healthcare Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2022 110
2023 120
2024 129
2025 137
2026 139
2027-2031 $ 541