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Debt - long-term debt by future maturity (Details)
$ in Millions
Aug. 31, 2018
USD ($)
Long Term Debt by Future Maturity [Abstract]  
2019 $ 1,969
2020 1,277
2021 519
2022 1,250
2023 1,200
Later 8,262
Total estimated future maturities $ 14,477