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Commitments and Contingencies (Details) £ in Millions, NZD in Millions |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) | Dec. 20, 2016 GBP (£) | Jun. 29, 2015 NZD | Jan. 31, 2015 USD ($) | Jan. 26, 2015 USD ($) | Jan. 26, 2015 CHF (SFr) | Dec. 31, 2014 USD ($) | Dec. 02, 2014 USD ($) | Dec. 02, 2014 CHF (SFr) | Sep. 14, 2010 USD ($) | Jun. 01, 2007 USD ($) | Jun. 01, 2007 CHF (SFr) | Aug. 31, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2014 CHF (SFr) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) | Apr. 30, 2014 GBP (£)
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,368,000,000 | $ 2,282,000,000 | $ 4,749,000,000 | $ 4,558,000,000 |  |
Maximum potential funding under commitments | $ 88,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 88,000,000 |  | 88,000,000 |  | $ 95,000,000 |
Letters of credit outstanding | 89,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 89,000,000 |  | 89,000,000 |  | 90,000,000 |
Potential Claim for Pension Advisory Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible loss | 57,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 57,000,000 |  | 57,000,000 |  |  | £ 45
Opry Mills Mall Limited Partnership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
International Road Transport Union | Litigation Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought | 47,000,000 |  |  |  |  |  |  |  |  |  |  | SFr 46,000,000 |  |  |  |  |  |  |  |  |  |
Damages awarded |  |  |  |  |  |  | $ 28,000,000 |  |  |  |  |  |  |  |  | SFr 27,900,000 |  |  |  |  |  |
Damages awarded excluding interest and costs | 17,000,000 |  |  |  |  |  |  |  | SFr 16,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Case settlement amount |  |  |  | $ 14,000,000 |  | SFr 12,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement, maximum liability | 15,000,000 |  |  |  |  | SFr 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
International Road Transport Union | Litigation USD Denominated Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  | $ 344,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
International Road Transport Union | Litigation Expenses and Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought |  |  |  |  |  |  |  |  |  |  | $ 30,000,000 |  |  |  |  |  |  |  |  |  |  |
Pending Litigation | Trustees Of Gleeds Pension Fund 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible loss | 89,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 89,000,000 |  | 89,000,000 |  |  |
Damages sought | £ |  | £ 70 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pending Litigation | Lyttleton Port Company Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought | 134,000,000 |  | NZD 184 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible loss | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible loss | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000,000 |  | 300,000,000 |  |  |
Aviation and Aerospace Broking Industry |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |
Discontinued Operations, Disposed of by Sale | Tempo Business | Property Lease Guarantee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor Obligations, Current Carrying Value | 39,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,000,000 |  | 39,000,000 |  |  |
Maximum potential funding under commitments | 108,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 108,000,000 |  | 108,000,000 |  |  |
Discontinued Operations, Disposed of by Sale | Tempo Business | Performance Guarantee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor Obligations, Current Carrying Value | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 |  | 4,000,000 |  |  |
Maximum potential funding under commitments | $ 401,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 401,000,000 |  | $ 401,000,000 |  |  |

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