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Income Taxes - Provision for Income Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
May 31, 2019
May 31, 2018
May 31, 2017
Current:      
Federal $ 74 $ 1,167 $ 398
State 56 45 82
Foreign 608 533 439
Total Current 738 1,745 919
Deferred:      
Federal (33) 595 (279)
State (9) 25 (9)
Foreign 76 27 15
Total Deferred 34 647 (273)
Income tax expense $ 772 $ 2,392 $ 646