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Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
May 31, 2016
May 31, 2015
May 31, 2016
May 31, 2015
Goodwill and Other Intangible Assets [Abstract]        
Amortization expense for intangible assets $ 104 $ 104 $ 320 $ 368