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Commitments and Contingencies (Details) € in Millions, £ in Millions, SFr in Millions, NZD in Millions |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
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Jun. 29, 2015 USD ($) | Jun. 29, 2015 NZD | Jun. 24, 2015 USD ($) | Jun. 24, 2015 EUR (€) | May. 29, 2015 USD ($) | Jan. 26, 2015 USD ($) | Jan. 26, 2015 CHF (SFr) | Dec. 02, 2014 USD ($) | Dec. 02, 2014 CHF (SFr) | Jan. 02, 2014 GBP (£) | Jan. 02, 2014 USD ($) | Dec. 27, 2012 USD ($) | Dec. 27, 2012 EUR (€) | Jan. 27, 2011 USD ($) | Sep. 14, 2010 USD ($) | Jun. 01, 2007 USD ($) | Jun. 01, 2007 CHF (SFr) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2014 CHF (SFr) | Jun. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Apr. 30, 2014 GBP (£) | Apr. 30, 2014 USD ($)
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Range of possible loss, minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 |  |
Range of possible loss, maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000,000 |  |  |  | 300,000,000 | 300,000,000 |  |
Maximum potential funding under commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 91,000,000 |  | $ 112,000,000 |  | 91,000,000 | 91,000,000 |  |
Letters of credit outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 62,000,000 |  | 95,000,000 |  | 62,000,000 | 62,000,000 |  |
Potential Claim for Pension Advisory Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | £ 45 | $ 71,000,000
Commitments to fund certain limited partnerships or subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum potential funding under commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,000,000 |  | 14,000,000 |  | 12,000,000 | 12,000,000 |  |
Commitments funded |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 2,000,000 |  |
Northrop Grumman Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 340,000,000 |  |  |  |  |  |  |  |  |  |  |
Case settlement amount |  |  |  |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for legal settlements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000 |  |  |  |  |  |  |
Opry Mills Mall Limited Partnership [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |
Amount of coverage for damages contended by the insurers |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |
Difference amount of damages sought by the client |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |
Damages awarded |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |
Philips [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought |  |  |  |  |  |  |  |  |  | £ 189 | $ 298,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
International Road Transport Union [Member] | Litigation Award [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 49,000,000 | SFr 46.0 |  |  |  |  |  |  |  |
Damages awarded excluding interest and costs |  |  |  |  |  |  |  | $ 18,000,000 | SFr 16.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages awarded |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,000,000 | SFr 27.9 |  |  |  |
Case settlement amount |  |  |  |  |  | $ 14,000,000 | SFr 12.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement, maximum liability |  |  |  |  |  | 9,000,000 | SFr 8.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
International Road Transport Union [Member] | Litigation USD Denominated Award [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 |  |  |  |  |  |  |  |  |
Damages awarded excluding interest and costs |  |  |  |  |  |  |  | $ 3,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages awarded |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  |  |  |
Case settlement amount |  |  |  |  |  | 4,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement, maximum liability |  |  |  |  |  | $ 115,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
International Road Transport Union [Member] | Litigation Expenses and Interest [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,000,000 |  |  |  |  |  |  |  |  |
Versicherung Aktiengesellschaft [Member] | Litigation Award [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought |  |  |  |  |  |  |  |  |  |  |  | $ 204,000,000 | € 183.0 |  |  |  |  |  |  |  |  |  |  |  |
Case settlement amount |  |  | $ 2,000,000 | € 1.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pending Litigation [Member] | Lyttleton Port Company Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought | $ 126,200,000 | NZD 184 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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