| Accretion Expense, Including Asset Retirement Obligations | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Accretion Expense, Including Asset Retirement Obligations, Total | en-US | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| Amount of accretion expense, which includes, but is not limited to, accretion expense from asset retirement obligations, environmental remediation obligations, and other contingencies. | en-US | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |