Subsequent Event Subsequent Event (Details) (January 2014 Buyback Plan [Member], USD $) In Millions, unless otherwise specified	1 Months Ended
Jan. 31, 2014
January 2014 Buyback Plan [Member]
Subsequent Event [Line Items]
Share buyback plan, authorized amount	$ 5,000

Amount of a stock repurchase plan authorized by an entity's Board of Directors.

No definition available.

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