Commitments and contingencies.

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- Definition

Litigation Settlement, Amount Awarded from Other Party, Benefit To Customer, Regulatory Approval, Number Of Approved Applications

+ References

No definition available.

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- Definition

Litigation Settlement, Amount Awarded from Other Party, Benefit To Customer, Regulatory Approval, Number Of Denied Applications

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No definition available.

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- Definition

Litigation Settlement, Amount Awarded from Other Party, Benefit To Customer, Regulatory Approval, Number Of Pending

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No definition available.

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- Definition

Litigation Settlement, Amount Awarded from Other Party, Benefit To Customer, Regulatory Approval, Number Of Utility Subsidiaries

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No definition available.

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- Definition

Litigation Settlement, Amount Awarded From Other Party, Escrow

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No definition available.

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- Definition

Litigation Settlement, Amount Awarded From Other Party, Escrow, Total Regulatory Liabilities

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No definition available.

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- Definition

Litigation Settlement, Amount Awarded From Other Party, Escrow, Transfers

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No definition available.

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- Definition

Litigation Settlement, Number Of Settlements

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No definition available.

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- Definition

Loss Contingency Accrual, Net of Tax

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No definition available.

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- Definition

Loss Contingency, Cost Cap For Proposed Facilities

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No definition available.

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- Definition

Loss Contingency, Cost Cap For Proposed Facilities, Increase

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No definition available.

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- Definition

Loss Contingency, Estimate Of The Future Contribution

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No definition available.

+ Details

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- Definition

Loss Contingency, Estimated Reasonably Possible Loss, Amount

+ References

No definition available.

+ Details

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- Definition

Loss Contingency, Natural Gas Outage Inconvenience Per Household, Amount

+ References

No definition available.

+ Details

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- Definition

Loss Contingency, Natural Gas Outage Inconvenience Per Household, Average Amount Paid

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No definition available.

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- Definition

Loss Contingency, Number of Agreements

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- Definition

Loss Contingency, Number of Agreements, Valid

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- Definition

Loss Contingency, Number of Agreements, Void

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- Definition

Loss Contingency, Number of Recommended Operational Improvements

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No definition available.

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- Definition

Loss Contingency, Pending Claims, Number of Answers Provided For

+ References

No definition available.

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- Definition

Number of Customer Affected By Loss of Natural Gas Service

+ References

No definition available.

+ Details

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- Definition

Number of Customer Serving

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Customers For Whom A Precautionary Boil Water Advisory Was Issued To

+ References

No definition available.

+ Details

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- Definition

Number of Customers Who Completed Claim Process

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Number of Focused General Investigations

+ References

No definition available.

+ Details

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- Definition

Number Of Subsurface Slant Wells

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Potential Condemnation, Asset Value

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

Potential Condemnation, Number of Statutory Standards Incorrectly Applied By Agency

+ References

No definition available.

+ Details

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- Definition

Potential Condemnation, Offer Rejection Amount

+ References

No definition available.

+ Details

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- Definition

Potential Condemnation, Parcels of Land

+ References

No definition available.

+ Details

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- Definition

Public Utilities, Aggregate Costs

+ References

No definition available.

+ Details

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- Definition

Public Utilities, Allowance for Funds Used During Construction

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- Definition

Public Utility, Approved Cost Estimates

+ References

No definition available.

+ Details

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- Definition

Public Utility, Approved Recovery Amount

+ References

No definition available.

+ Details

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- Definition

Public Utility, Daily Production, Number of Gallons Related to Desalinated Water

+ References

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Public Utility, Initial Daily Production, Number of Gallons Related to Desalinated Water

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- Definition

Public Utility, Pending Cost Estimates

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+ Details

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- Definition

Area of a real estate property.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 970
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-Section S99
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-URI https://asc.fasb.org/1943274/2147478979/970-360-S99-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
-Section 30
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478150/970-360-30-2

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- Definition

Amount awarded from other party in judgment or settlement of litigation.

+ References

No definition available.

+ Details

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- Definition

Amount awarded to other party in judgment or settlement of litigation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

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- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

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-Name Accounting Standards Codification
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-10

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- Definition

Number of claims dismissed.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-9

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- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.Z.5.Q2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480781/205-20-S99-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section S45
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480868/205-20-S45-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-9

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/exampleRef
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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-2

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- Definition

Number of pending claims pertaining to a loss contingency.

+ References

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Commitments and Contingencies (Details) gal in Millions						3 Months Ended
Commitments and Contingencies (Details) gal in Millions	Sep. 30, 2026 USD ($) lawsuit subsidiary	Sep. 10, 2026 USD ($) settlement	Jun. 23, 2026 slantWell	Sep. 12, 2025 USD ($)	Apr. 24, 2024 claim	Dec. 31, 2024 USD ($) customer	Oct. 28, 2026 lawsuit	Oct. 23, 2026 USD ($)	Jun. 16, 2026 gal	Oct. 09, 2025 a	Aug. 14, 2025 a	May 21, 2025 USD ($)	May 09, 2025 a	Jul. 24, 2024 improvement	Jun. 14, 2024 lawsuit	Dec. 31, 2023 standard	Dec. 20, 2023 lawsuit	Dec. 06, 2023 USD ($)	Nov. 16, 2023 investigation	Nov. 11, 2023 customer	Nov. 10, 2023 customer	Apr. 30, 2023 USD ($)	Dec. 05, 2022 USD ($)	Oct. 31, 2022 gal	Feb. 28, 2021 parcel	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 agreement
Commitments And Contingencies [Line Items]
Loss contingency, probable loss	$ 11,000,000
Daily production, number of gallons related to desalinated water \| gal									6.4															6.4
Initial daily production, number of gallons related to desalinated water \| gal									4.8															4.8
Number of dismissed claims \| claim					1
Number of new subsurface slant wells \| slantWell			4
Number of settlements \| settlement		4
Settlement payments received	$ 235,000,000	$ 149,000,000
Number of utility subsidiaries \| subsidiary	11
Number of approved applications \| subsidiary	8
Number of denied regulatory application \| subsidiary	2
Number of applications pending \| subsidiary	1
Total escrow account funds held in law firm	$ 108,000,000
Total regulatory liabilities	137,000,000
Escrow funds transferred	126,000,000
WVAWC
Commitments And Contingencies [Line Items]
Loss contingency, probable loss	7,000,000
Loss contingency, possible loss	9,000,000
Loss contingency, estimated reasonably possible loss, amount	$ 1,000,000
Cal Am
Commitments And Contingencies [Line Items]
Number of agreements, void \| agreement																													4
Number of agreements \| agreement																													5
Number of agreements, valid \| agreement																													1
Dunbar \| WVAWC
Commitments And Contingencies [Line Items]
Loss contingency, probable loss						$ 5,000,000
Litigation settlement, proposed maximum pre-tax amount				$ 18,000,000
Estimate of the future contribution				$ 5,000,000
Loss contingency, probable loss, net of tax						$ 4,000,000
West Virginia \| WVPSC
Commitments And Contingencies [Line Items]
Number of focused general investigations \| investigation																			2
West Virginia \| WVAWC
Commitments And Contingencies [Line Items]
Number of customers for whom a precautionary boil water advisory was issued to \| customer																				300
Number of customers who completed claim process \| customer						594
Natural gas outage inconvenience per household, average amount paid						$ 1,500
West Virginia \| Mountaineer Gas Company
Commitments And Contingencies [Line Items]
Number of customers serving \| customer																					220,000
Number of customers affected by loss of natural gas service \| customer																					1,500
West Virginia \| Mountaineer Gas Company and WVAWC
Commitments And Contingencies [Line Items]
Number of pending lawsuits \| lawsuit	4														4
Number of pending lawsuits with answers provided for \| lawsuit																	3
Number of recommended operational improvements \| improvement														3
West Virginia \| Mountaineer Gas Company and WVAWC \| Subsequent Event
Commitments And Contingencies [Line Items]
Number of pending lawsuits \| lawsuit							4
Monterey \| Cal Am
Commitments And Contingencies [Line Items]
Water supply projected area \| a										2,500	2,600		2,500
Potential condemnation, asset value																										$ 513,000,000
Potential condemnation, parcels of land \| parcel																									58
Potential condemnation, number of statutory standards incorrectly applied by agency \| standard																2
Potential condemnation, offer rejection amount																						$ 448,800,000
Monterey \| Cal Am \| SWRCB
Commitments And Contingencies [Line Items]
Approved cost estimates																											$ 279,000,000
Aggregate costs	$ 371,000,000
Allowance for funds used during construction	123,000,000
Cost cap for proposed facilities, final																							$ 62,000,000
Cost cap for extraction wells												$ 11,000,000
Monterey \| Cal Am \| SWRCB \| Subsequent Event
Commitments And Contingencies [Line Items]
Updated cost estimate, pending approval								$ 825,000,000
Maximum
Commitments And Contingencies [Line Items]
Loss contingency, possible loss	$ 9,000,000
Maximum \| West Virginia \| WVAWC
Commitments And Contingencies [Line Items]
Natural gas outage inconvenience per household, amount																		$ 2,000
Maximum \| Monterey \| Cal Am \| SWRCB
Commitments And Contingencies [Line Items]
Approved recovery amount																							$ 123,000,000					$ 50,000,000