Equity (Details 3) (USD $) In Millions, unless otherwise specified	1 Months Ended
Aug. 31, 2010
Treasury Stock
Authorized amount of common stock repurchase (in dollars)	$ 200

The amount authorized by an entity's Board of Directors under a stock repurchase plan.

No definition available.

Name:	us-gaap_StockRepurchaseProgramAuthorizedAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration