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Retirement Plans - Schedule of Expected Future Benefit Payments (Details)
$ in Millions
May 31, 2020
USD ($)
Pension Plans [Member] | U.S. Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 1,008
2022 1,093
2023 1,154
2024 1,242
2025 1,331
2026-2030 7,967
Pension Plans [Member] | International Pension Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 50
2022 46
2023 51
2024 57
2025 62
2026-2030 414
Postretirement Healthcare Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 104
2022 113
2023 121
2024 126
2025 120
2026-2030 $ 433