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Retirement Plans - Schedule of Expected Future Benefit Payments (Details)
$ in Millions
May 31, 2018
USD ($)
Pension Plans [Member] | U.S. Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2019 $ 680
2020 781
2021 846
2022 951
2023 1,071
2024-2028 7,325
Pension Plans [Member] | International Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2019 48
2020 48
2021 54
2022 71
2023 79
2024-2028 428
Postretirement Healthcare Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2019 62
2020 65
2021 69
2022 73
2023 76
2024-2028 $ 369