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Goodwill and Other Intangible Assets, Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details)
$ in Millions
May. 31, 2015
USD ($)
Estimated annual intangible assets amortization expense [Abstract]  
2015 $ 482
2016 425
2017 380
2018 342
2019 $ 318