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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Nov. 30, 2020
Nov. 30, 2019
Other Comprehensive Income, Tax Amounts        
Foreign currency translation adjustments, tax expense $ 6 $ 7 $ 4 $ 4
Amortization of prior service credit, tax benefit $ 0 $ 6 $ 1 $ 12