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Cash and Cash Equivalents (Details) In Millions, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2014 USD ($) | Jun. 30, 2014 GBP (£) | Dec. 31, 2013 USD ($) | Dec. 31, 2013 GBP (£)
Cash, Cash Equivalents, and Short-term Investments [Abstract] |  |  |  |
Short-term investment, minimum maturity period | 3 months | 3 months |  |
Short-term investment, maximum maturity period | 1 year | 1 year |  |
Cash and Cash Equivalents and Short-Term Investments | $ 726 |  | $ 1,000 |
Restricted Cash and Investments, Current | 161 |  | 214 |
Operating funds in U.K. | 69.0 | 40.5 | 126.0 | 77.0
Cash and cash equivalents, restricted | $ 92 |  | $ 88 |

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- Definition Represents cash that is restricted for minimum operating fund requirements. + References No definition available. + Details
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- Definition Short Term Investments Maturity Maximum Period + References No definition available. + Details
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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The current cash, cash equivalents and investments that are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes current cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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