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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Feb. 28, 2018
Feb. 28, 2017
Other Comprehensive Income, Tax Amounts        
Foreign currency translation adjustments, tax expense (benefit) $ 9 $ (3) $ 26 $ (19)
Amortization of prior service credit, tax benefit $ 7 $ 12 $ 29 $ 34