Subsequent Event (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	0 Months Ended
Feb. 28, 2013	Mar. 08, 2013 Subsequent Event [Member]
Subsequent Event [Line Items]
Subsequent Event, Date	Mar. 08, 2013
Payments for Repurchase of Redeemable Noncontrolling Interest		$ 25

Date the event occurred after the balance sheet date but before financial statements are issues or available to be issued, in CCYY-MM-DD format.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 855

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662

Name:	us-gaap_SubsequentEventsDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration