Number of Uranium Mines

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Percentage of Response Costs

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Restore acreage

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of damages awarded to the plaintiff in the legal matter.

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Number of defendants named in a legal action.

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Number of pending claims pertaining to a loss contingency.

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Carrying amount as of the balance sheet date of known and reasonably estimable amounts of recoveries from third-parties pertaining to an entity's environmental remediation obligations. An entity's balance sheet may include several assets that relate to an environmental remediation obligation. Among them are the following: a. Receivables from other potentially responsible parties that are not providing initial funding; b. anticipated recoveries from insurers; and c. anticipated recoveries from prior owners as a result of indemnification agreements.

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Litigation and Environmental - Environmental Matters (Details)					240 Months Ended
	Apr. 16, 2019	Mar. 29, 2019 Parties	May 04, 2018 USD ($) a	Nov. 08, 2013 Parties	Dec. 31, 1969	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jan. 31, 2015 cases
Loss Contingencies [Line Items]
Recorded Third-Party Environmental Recoveries Receivable \| $						$ 12,000,000	$ 15,000,000
Percentage of Response Costs	35.00%
Accrual for Environmental Loss Contingencies \| $						$ 259,000,000	$ 259,000,000
Rare Metals Inc.
Loss Contingencies [Line Items]
Number of Uranium Mines					20
Parish of Plaquemines, Louisiana \| Coastal Zone \| TGP
Loss Contingencies [Line Items]
Loss Contingency, Number of Defendants \| Parties				17
Parish Orleans, Louisiana \| Coastal Zone \| SNG
Loss Contingencies [Line Items]
Loss Contingency, Number of Defendants \| Parties		10
Judicial District of Louisiana \| Coastal Zone
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number								40
Judicial District of Louisiana \| Coastal Zone \| TGP
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number								1
Judicial District of Louisiana \| Coastal Zone \| SNG
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number								1
Vintage Assets Inc. \| Parish of Plaquemines, Louisiana \| TGP and SNG
Loss Contingencies [Line Items]
Restore acreage \| a			9.6
Loss Contingency, Damages Awarded, Value \| $			$ 1,104
Louisiana Landowner Coastal Erosion Litigation \| Judicial District of Louisiana \| TGP and SNG
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number								2
Louisiana Landowner Coastal Erosion Litigation \| Judicial District of Louisiana \| TGP
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number								2
Louisiana Landowner Coastal Erosion Litigation \| Judicial District of Louisiana \| SNG
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number								2