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Commitments and Contingencies (Details) |  |  |  | 3 Months Ended | 6 Months Ended |  |  | 0 Months Ended |  |  | 0 Months Ended
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Jun. 30, 2014 USD ($) | Dec. 31, 2013 USD ($) | Jun. 30, 2014 Potential Claim for Pension Advisory Services [Member] USD ($) | Jun. 30, 2014 Potential Claim for Pension Advisory Services [Member] GBP (£) | Jun. 30, 2014 Commitments to fund certain limited partnerships or subsidiaries [Member] USD ($) | Jun. 30, 2014 Commitments to fund certain limited partnerships or subsidiaries [Member] USD ($) | Dec. 31, 2013 Commitments to fund certain limited partnerships or subsidiaries [Member] USD ($) | Jun. 15, 2011 Commitments to fund certain limited partnerships or subsidiaries [Member] Subsidiaries [Member] Term Credit Agreement [Member] USD ($) | Mar. 20, 2012 Commitments to fund certain limited partnerships or subsidiaries [Member] Subsidiaries [Member] Five-Year Agreement [Member] | Mar. 20, 2012 Commitments to fund certain limited partnerships or subsidiaries [Member] Subsidiaries [Member] Five-Year Agreement [Member] USD ($) | Oct. 15, 2010 Commitments to fund certain limited partnerships or subsidiaries [Member] Subsidiaries [Member] Euro Facility Agreement [Member] EUR (€) | Sep. 14, 2010 Opry Mills Mall Limited Partnership [Member] USD ($) | Jan. 02, 2014 Philips [Member] USD ($) | Jan. 02, 2014 Philips [Member] GBP (£) | Jan. 02, 2014 Northrop Grumman Corporation [Member] USD ($) | Dec. 27, 2012 Versicherung Aktiengesellschaft [Member] Litigation Award [Member] USD ($) | Dec. 27, 2012 Versicherung Aktiengesellschaft [Member] Litigation Award [Member] EUR (€) | Jun. 01, 2007 International Road Transport Union [Member] Litigation USD Denominated Award [Member] USD ($) | Jun. 01, 2007 International Road Transport Union [Member] Litigation Award [Member] USD ($) | Jun. 01, 2007 International Road Transport Union [Member] Litigation Award [Member] CHF | Jun. 01, 2007 International Road Transport Union [Member] Litigation Expenses and Interest [Member] USD ($) | Dec. 12, 2012 Mazeikiu Nafta [Member] USD ($)
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Range of Possible Loss, Minimum | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Range of Possible Loss, Maximum | 700,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 | 322,000,000 | 189,000,000 | 340,000,000 | 250,000,000 | 183,000,000 | 3,000,000 | 51,000,000 | 46,000,000 | 30,000,000 | 125,000,000
Loss Contingency, Estimate of Possible Loss |  |  | 77,000,000 | 45,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of coverage for damages contended by the insurers |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |
Difference amount of damages sought by the client |  |  |  |  |  |  |  |  |  |  |  | 150,000,000 |  |  |  |  |  |  |  |  |  |
Maximum potential funding under commitments | 92,000,000 | 98,000,000 |  |  | 20,000,000 | 20,000,000 | 34,000,000 | 450,000,000 |  | 400,000,000 | 650,000,000 |  |  |  |  |  |  |  |  |  |  |
Term of credit agreement |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding | 98,000,000 | 71,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments funded |  |  |  |  | $ 4,000,000 | $ 14,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition This element represents the amount of coverage as contended by the insurers for the loss. + References No definition available. + Details
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- Definition This element represents the difference amount of damages sought by the client after adjusting for amount claimed from insurers. + References No definition available. + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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- Definition The estimated minimum amount of possible loss from the contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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