| SourceName | Taxonomy Technical Improvement | http://fasb.org/srt/role/changeNote/changeNote |
| TaxonomyVersion | 2019 | http://fasb.org/srt/role/changeNote/changeNote |
| ChangeDate | 2018-10 | http://fasb.org/srt/role/changeNote/changeNote |
| ModifiedLabels | true | http://fasb.org/srt/role/changeNote/changeNote |
| ModifiedDocumentation | true | http://fasb.org/srt/role/changeNote/changeNote |
| PreviousDocumentation | Total amount of product committed to be supplied under existing contracts or agreements. | http://fasb.org/srt/role/changeNote/changeNote |
| elementCreationTaxonomyVersion | 2008 | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |