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Summary of Significant Accounting Policies - Recently Adopted Accounting Standards (Details) - USD ($)
$ in Millions
May 31, 2021
May 31, 2020
Jun. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Retained earnings $ (3,179) $ 191  
Deferred income taxes and other assets (2,921) (2,326)  
Prepaid expenses and other current assets (1,498) (1,653)  
Deferred income taxes and other liabilities $ 2,955 $ 2,684  
Accounting Standards Update 2016-16      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Retained earnings     $ 507
Deferred income taxes and other assets     422
Prepaid expenses and other current assets     45
Deferred income taxes and other liabilities     $ 40