Borrowings, Note Issuances (Details) $ in Millions	12 Months Ended
	Aug. 31, 2016 USD ($)
Total $6.0 billion debt issuance [Member]
Long-Term Debt [Abstract]
Net proceeds from notes payable	$ 6,000
Total issuance costs	30
Fair value of the notes	$ 6,200
Percentage of principal amount of fixed rate notes can be redeemed	101.00%
Total $8.0 Billion Debt Issuance [Member]
Long-Term Debt [Abstract]
Repayment of debt	$ 750
Net proceeds from notes payable	7,900
Total issuance costs	42
Fair value of the notes	7,700
Maximum aggregate outstanding amount of indebtedness	2,000
Total $4.0 Billion Debt Issuance [Member]
Long-Term Debt [Abstract]
Fair value of the notes	1,800
Total $1.0 Billion Debt Issuance [Member]
Long-Term Debt [Abstract]
Fair value of the notes	300
Total 700 million Pounds Debt Issuance [Member]
Long-Term Debt [Abstract]
Fair value of the notes	1,000
Total 750 million Euros Debt Issuance [Member]
Long-Term Debt [Abstract]
Fair value of the notes	900
Total 700 million Pounds and 750 million Euros Debt Issuance [Member]
Long-Term Debt [Abstract]
Net proceeds from notes payable	2,000
Total issuance costs	$ 11