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Commitments and Contingencies (Details) £ in Millions, NZD in Millions |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2016 USD ($) | Jun. 29, 2015 NZD | Jan. 26, 2015 CHF (SFr) | Jan. 26, 2015 USD ($) | Dec. 02, 2014 CHF (SFr) | Dec. 02, 2014 USD ($) | Jan. 02, 2014 GBP (£) | Sep. 14, 2010 USD ($) | Jun. 01, 2007 CHF (SFr) | Jun. 01, 2007 USD ($) | Aug. 31, 2015 USD ($) | Jun. 30, 2015 GBP (£) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 CHF (SFr) | Dec. 31, 2014 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Apr. 30, 2014 GBP (£)
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Range of possible loss, minimum | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |
Range of possible loss, maximum | 300,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000,000.0 |  |
Letters of credit outstanding | 82,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 82,000,000 | $ 58,000,000 |
Maximum potential funding under commitments | 75,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,000,000 | 104,000,000 |
Potential Claim for Pension Advisory Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible loss | 64,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 64,000,000 |  | £ 45
Commitments to fund certain limited partnerships or subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum potential funding under commitments | 12,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,000,000 | $ 12,000,000 |
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 |  |  |  |  |  |  |  |  |  |  | $ 204,000,000 |  | $ 200,000,000 |  |  |  |  |
Philips [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought | 410,000,000 |  |  |  |  |  | £ 189 |  |  |  |  | £ 290 |  |  |  | $ 267,000,000 |  |
International Road Transport Union [Member] | Litigation Award [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought | 47,000,000 |  |  |  |  |  |  |  | SFr 46,000,000 |  |  |  |  |  |  |  |  |
Damages awarded | 29,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | SFr 27,900,000 |  |  |  |
Damages awarded excluding interest and costs | 17,000,000 |  |  |  | SFr 16,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Case settlement amount | 13,000,000 |  | SFr 12,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement, maximum liability | 9,000,000 |  | SFr 8,700,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
International Road Transport Union [Member] | Litigation USD Denominated Award [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought |  |  |  |  |  |  |  |  |  | $ 3,000,000 |  |  |  |  |  |  |  |
Damages awarded |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  |
Damages awarded excluding interest and costs |  |  |  |  |  | $ 3,100,000 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Pending Litigation [Member] | Lyttleton Port Company Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought | $ 123,000,000 | NZD 184 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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