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Claims, Lawsuits, and Other Contingencies - Narrative (Details) $ in Millions |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) | Sep. 06, 2018 USD ($) | Oct. 03, 2017 NZD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2019 USD ($)
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |
Maximum potential funding under commitments | $ 89,000,000 |  |  | $ 89,000,000 | $ 89,000,000 |  | $ 110,000,000
Letters of credit outstanding | 73,000,000 |  |  | 73,000,000 | 73,000,000 |  | $ 73,000,000
Discontinued Operations, Disposed of by Sale | Property Lease Guarantee | Tempo Business |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |
Maximum potential funding under commitments | 62,000,000 |  |  | 62,000,000 | 62,000,000 |  |
Guarantor obligations, current carrying value | 10,000,000 |  |  | 10,000,000 | 10,000,000 |  |
Loss contingency accrual payments |  |  |  | 0 | 0 |  |
Discontinued Operations, Disposed of by Sale | Performance Guarantee | Tempo Business |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |
Maximum potential funding under commitments | 127,000,000 |  |  | 127,000,000 | 127,000,000 |  |
Guarantor obligations, current carrying value | 1,000,000 |  |  | 1,000,000 | 1,000,000 |  |
Loss contingency accrual payments |  |  |  | 0 | 0 |  |
Aviation and Aerospace Broking Industry |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |
Revenue |  |  |  |  |  | $ 100,000,000 |
Christchurch City Council | Pending Litigation |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |
Damages sought | 339,000,000 |  | $ 528 |  |  |  |
Minimum |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |
Estimate of possible loss | 0 |  |  | 0 | 0 |  |
Minimum | Pilkington North America, Inc. |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |
Damages sought |  | $ 45,000,000 |  |  |  |  |
Maximum |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |
Estimate of possible loss | $ 100,000,000 |  |  | $ 100,000,000 | $ 100,000,000 |  |
Maximum | Pilkington North America, Inc. |  |  |  |  |  |  |
Legal, Guarantees and Indemnifications |  |  |  |  |  |  |
Damages sought |  | 85,000,000 |  |  |  |  |
Damages awarded |  | $ 15,000,000 |  |  |  |  |

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