Short-Term Borrowings and Long-Term Debt, Other Borrowings (Details) £ in Millions, $ in Millions	12 Months Ended
	Aug. 31, 2015 USD ($)	Aug. 31, 2014 USD ($)	Aug. 31, 2015 GBP (£)	Dec. 31, 2014	Dec. 29, 2014 USD ($)	Nov. 10, 2014 USD ($)
Line of Credit Facility [Line Items]
Spot rate				1.56
United Kingdom, Pounds
Line of Credit Facility [Line Items]
Spot rate	1.54		1.54
Commercial Paper [Member]
Line of Credit Facility [Line Items]
Balance outstanding at fiscal year-end	$ 0	$ 0
Average daily short-term borrowings	$ 82	$ 4
Weighted-average interest rate	0.52%	0.23%	0.52%
Maximum [Member]
Line of Credit Facility [Line Items]
Maximum aggregate outstanding amount of indebtedness	$ 2,000
Term Loan [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	2,200		£ 1,450
Amount borrowed | £			£ 1,450
Fair value of the notes	2,200
Fees related to borrowings	$ 14
Term Loan [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Debt to total capitalization ratio	0.60		0.60
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity					$ 3,000	$ 2,250
Term of facility	5 years
Revolving Credit Facility [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Debt to total capitalization ratio	0.60		0.60
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity					$ 500	$ 375
364-Day Credit Agreement [Member]
Line of Credit Facility [Line Items]
Balance outstanding at fiscal year-end	$ 0
Amount borrowed	$ 750
364-Day Credit Agreement [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Debt to total capitalization ratio	0.60		0.60