Subsequent Events (Details) - USD ($) $ in Millions			3 Months Ended	9 Months Ended
		Jul. 09, 2015	May. 31, 2015	May. 31, 2015	Aug. 10, 2015
Subsequent Event [Line Items]
Percentage of aggregate principal amount redeemed			100.00%	100.00%
Maximum aggregate outstanding			$ 2,000	$ 2,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Term of credit agreement		364 days
Notes Payable Due 2017 [Member]
Subsequent Event [Line Items]
Stated interest rate (in hundredths)	[1]		1.80%	1.80%
Maturity year	[1]			2017
Notes Payable Due 2017 [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Stated interest rate (in hundredths)		1.80%
Maturity year		2017
Face amount of notes issued					$ 1,000
Notes Payable Due 2019 [Member]
Subsequent Event [Line Items]
Stated interest rate (in hundredths)	[1],[2]		5.25%	5.25%
Maturity year	[1],[2]			2019
Notes Payable Due 2019 [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Stated interest rate (in hundredths)		5.25%
Maturity year		2019
Face amount of notes issued					750
Aggregate principal amount outstanding after redemption					$ 250

[1] All notes are presented net of unamortized discount and debt issuance costs, where applicable.

[2] Also includes interest rate swap fair market value adjustments, see Note 11, Fair Value Measurements for additional fair value disclosures.