Depreciation and Amortization (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2016	May 31, 2015
Depreciation and Amortization [Abstract]
Depreciation expense	$ 353	$ 339	$ 997	$ 906
Intangible asset and other amortization	94	99	274	358
Total depreciation and amortization expense	$ 447	$ 438	$ 1,271	$ 1,264