Income Taxes (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
U.S. [Member] \| Expiring 2013 - 2020 [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 74
U.S. [Member] \| Expiring 2021 - 2025 [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	72
United Kingdom [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 116

The sum of domestic, foreign and state and local operating loss carryforwards, before tax effects, available to reduce future taxable income under enacted tax laws.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 109

-Paragraph 48

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_OperatingLossCarryforwards
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant