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Derivatives - Narrative (Details) $ in Millions	Jun. 30, 2026 USD ($)
Interest rate swaps
Derivative [Line Items]
Fair value of credit-risk derivative, net liability	$ 35
Natural gas supply contracts
Derivative [Line Items]
Fair value of credit-risk derivative, net liability	102
Natural gas supply contracts | Letter of Credit
Derivative [Line Items]
Collateral posted	$ 55

X

- Definition

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 185
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 4H
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- Definition

Fair value of credit risk derivative asset after deduction of credit risk derivative liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5A
-Publisher FASB
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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-Publisher FASB
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