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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Nov. 30, 2016
Nov. 30, 2015
Other Comprehensive Income, Tax Amounts        
Foreign currency translation adjustments, tax $ 21 $ 4 $ 16 $ 17
Amortization of prior service credit, net of tax $ 11 $ 11 $ 22 $ 18