Commitments and Contingencies (Details) (Wake Forest Royalty Litigation [Member], USD $) In Millions	12 Months Ended
Dec. 31, 2010
Wake Forest Royalty Litigation [Member]
Loss Contingencies [Line Items]
Royalty payments made under the licensing agreement	$ 86

Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Name:	us-gaap_RoyaltyExpense
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration