Subsequent Event (Narrative) (Details) (Maximum, USD $) In Millions, unless otherwise specified	0 Months Ended
Feb. 27, 2013	Oct. 29, 2013 Subsequent event
Subsequent Event [Line Items]
Stock repurchase program, authorized amount	$ 500	$ 500

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