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Lawsuits, Claims, Commitments and Contingencies (Details) $ in Millions	3 Months Ended
	Sep. 30, 2021 USD ($) MMBTU / d $ / MMBtu	Jun. 30, 2021 USD ($) MMBTU / d	Jun. 07, 2006 USD ($)
Long-term Purchase Commitment [Line Items]
Commitments under contracts | $			$ 6
Long-term purchase commitment amount | $		$ 32
Long-term purchase commitment, average price | $ / MMBtu	0.52
Shipment Of Natural Gas, Beginning May 2022 Thru April 2032
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount (in mmbtu/d) | MMBTU / d	32,700
Long-term purchase commitment amount | $	$ 62
Shipment Of Natural Gas, Beginning October 2021 Thru October 2036
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount (in mmbtu/d) | MMBTU / d		10,000
Shipment Of Natural Gas, Beginning November 2021 Thru December 2024
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment amount (in mmbtu/d) | MMBTU / d		5,500

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- Definition

Long-Term Purchase Commitment, Average Price

+ References

No definition available.

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- Definition

Long-Term Purchase Commitment, Minimum Flow Rate Required Per Day

+ References

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- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

+ References

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- Definition

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+ References

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- Definition

Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123406679&loc=d3e25336-109308

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