Borrowings, Loan Agreements and Other Borrowings (Details) £ in Millions, $ in Millions	3 Months Ended	12 Months Ended
	May 31, 2016 USD ($)	Aug. 31, 2016 USD ($) Tranche	Aug. 31, 2015 USD ($)	Aug. 31, 2014 USD ($)	Aug. 31, 2016 GBP (£)	Dec. 18, 2015 USD ($)	Oct. 27, 2015 USD ($)	Nov. 10, 2014 USD ($)
Line of Credit Facility [Line Items]
Senior unsecured bridge facility						$ 7,800	$ 12,800
Additional senior unsecured bridge facility						2,000
Interest paid, net of capitalized interest		$ 580	$ 472	$ 161
Commercial Paper [Member]
Line of Credit Facility [Line Items]
Balance outstanding at fiscal year-end		0	0
Average daily short-term borrowings		$ 14	$ 82
Weighted-average interest rate		0.66%	0.52%		0.66%
Additional Bridge Loan [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 5,000
Senior unsecured bridge facility						$ 3,000
Term of credit agreement		90 days
Bridge Credit Agreement [Member]
Line of Credit Facility [Line Items]
Term of credit agreement		364 days
Reduced commitment amount	$ 6,000
Reduced commitment amount after issuance of notes	$ 1,800
Term Loan [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 1,900			£ 1,450
Amount borrowed | £					£ 1,450
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		$ 0						$ 3,000
Term of facility		5 years
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity								$ 500
364-Day Credit Agreement [Member]
Line of Credit Facility [Line Items]
Amount borrowed		$ 750
2015 Credit Agreements [Member]
Line of Credit Facility [Line Items]
Fees related to borrowings		30
2016 Credit Agreements [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity		1,000
Reduced commitment amount		1,000
Reduced commitment amount after issuance of notes		$ 800
Number of tranches | Tranche		2
Tranche One [Member]
Line of Credit Facility [Line Items]
Term of credit agreement		3 years
Tranche Two [Member]
Line of Credit Facility [Line Items]
Term of credit agreement		5 years