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Contingencies - Environmental (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 04, 2011 | Jan. 31, 2015 USD ($) | Nov. 30, 2012 item | Jun. 30, 2017 USD ($) | Sep. 30, 2014 item | Jun. 30, 2017 USD ($) a action | Dec. 31, 2003 | Dec. 31, 1992 USD ($) company
Other Current Liabilities And Other Noncurrent Liabilities |  |  |  |  |  |  |  |
Environmental remediation |  |  |  |  |  |  |  |
Estimated potential liability for all environmental matters |  |  |  | $ 45 |  | $ 45 |  |
Waste Disposal Remediation | Lowry Landfill Site |  |  |  |  |  |  |  |
Environmental remediation |  |  |  |  |  |  |  |
Number of actions in which the company is actively involved | action |  |  |  |  |  | 0 |  |
Waste Disposal Remediation | Lowry Landfill Site | Waste Management |  |  |  |  |  |  |  |
Environmental remediation |  |  |  |  |  |  |  |
Project costs to date |  | $ 140 |  |  |  |  |  |
Period before projected completion of project when response cost is expected to exceed minimum amount |  |  |  |  |  |  | 3 years |
Estimated additional cleanup costs |  |  |  | 10 |  | $ 10 |  |
Estimated additional site costs for the potentially responsible party (PRP) group |  |  |  | $ 1 |  | 1 |  |
Waste Disposal Remediation | Lowry Landfill Site | Waste Management | Minimum |  |  |  |  |  |  |  |
Environmental remediation |  |  |  |  |  |  |  |
Site contingency response cost |  |  |  |  |  |  |  | $ 319
Waste Disposal Remediation | Lowry Landfill Site | Denver And Waste Management Litigation |  |  |  |  |  |  |  |
Environmental remediation |  |  |  |  |  |  |  |
Loss Contingency, Number of Defendants | company |  |  |  |  |  |  |  | 38
Waste Disposal Remediation | Lower Duwamish Site |  |  |  |  |  |  |  |
Environmental remediation |  |  |  |  |  |  |  |
Project costs to date |  |  |  |  |  | 100 |  |
Potential period for data review |  |  |  | 1 year |  |  |  |
Number of additional potentially responsible parties (PRPs) | item |  |  |  |  | 20 |  |  |
Total site remediation costs expected to cover river bottom area in excess of amount spent to date |  |  |  |  |  | $ 342 |  |
Area of river bottom to be remediated (in acres) | a |  |  |  |  |  | 200 |  |
Waste Disposal Remediation | Lower Duwamish Site | Minimum |  |  |  |  |  |  |  |
Environmental remediation |  |  |  |  |  |  |  |
Number of potentially responsible parties (PRPs) | item |  |  | 50 |  |  |  |  |
Number of industrial companies and governmental entities under review | item |  |  | 30 |  |  |  |  |
Number of PRP groups discussing allocation proposals | item |  |  | 2 |  |  |  |  |
Waste Disposal Remediation | Crown Vantage Landfill Site | Georgia Pacific and International Paper Claims |  |  |  |  |  |  |  |
Environmental remediation |  |  |  |  |  |  |  |
Project costs to date |  |  |  |  |  | $ 14 |  |
Amount of liability for site clean up by Rexam to successor (as a percentage) | 50.00% |  |  |  |  |  |  |
Waste Disposal Remediation | Curtis Paper Superfund Site | Georgia Pacific And International Paper |  |  |  |  |  |  |  |
Environmental remediation |  |  |  |  |  |  |  |
Project costs to date |  |  |  |  |  | 30 |  |
Rexam | Waste Disposal Remediation | Crown Vantage Landfill Site | Georgia Pacific and International Paper Claims | Georgia Pacific And International Paper |  |  |  |  |  |  |  |
Environmental remediation |  |  |  |  |  |  |  |
Amount of liability for site clean up costs by Rexam to successor |  |  |  |  |  | $ 7 |  |

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