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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Feb. 28, 2015
Other Comprehensive Income, Tax Amounts        
Foreign currency translation adjustments, tax $ 11 $ 18 $ 28 $ 41
Amortization of prior service credit, net of tax $ 12 $ 10 $ 30 $ 31