Derivative Instruments - Schedule of Volumetric Underlying Derivative Transactions (Details) - Buy MWh in Thousands, MMBTU in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2026 MWh MMBTU	Dec. 31, 2025 MMBTU MWh
Gain on non-trading derivatives, net \| Natural Gas
Derivatives, Fair Value [Line Items]
Net notional volume (energy measure) \| MMBTU	7,585	7,674
Gain on non-trading derivatives, net \| Electricity
Derivatives, Fair Value [Line Items]
Net notional volume (energy measure) \| MWh	1,162	951
Gain (Loss) on trading derivatives, net \| Natural Gas
Derivatives, Fair Value [Line Items]
Net notional volume (energy measure) \| MMBTU	1,502	2,425
Gain (Loss) on trading derivatives, net \| Electricity
Derivatives, Fair Value [Line Items]
Net notional volume (energy measure) \| MWh	2	0

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.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 182
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480401/815-10-55-182

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4B
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4B

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
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-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4B

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
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-Name Accounting Standards Codification
-Section 50
-Paragraph 4B
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4B

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4B
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4B

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4A
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A

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