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INCOME TAXES - Geographical Breakdown of Income before Provision for Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2019
May 31, 2018
May 31, 2017
Income Tax Disclosure [Abstract]      
Domestic $ 3,774 $ 3,366 $ 3,674
Foreign 8,494 9,058 8,006
Income before provision for income taxes $ 12,268 $ 12,424 $ 11,680