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Fair Value of Financial Instruments Fair Value Options Quantitative Disclosure (Details) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Low [Member]
Commodity Contracts
Electricity physical forwards	$ 31.90	$ 35.00
Natural gas financial swaps	2.35	2.71
Financial swaps - electricity	57.00	54.17
High [Member]
Commodity Contracts
Electricity physical forwards	208.00	270.00
Natural gas financial swaps	9.35	24.71
Financial swaps - electricity	206.00	143.70
Weighted Average [Member]
Commodity Contracts
Electricity physical forwards	93.59	101.27
Natural gas financial swaps	3.47	4.42
Financial swaps - electricity	97.99	104.21
Assets [Member]
Commodity Contracts
Electricity physical forwards	22,000,000	52,000,000
Natural gas financial swaps	3,000,000	6,000,000
Financial swaps - electricity	1,000,000	11,000,000
Total commodity contracts	26,000,000	69,000,000
Liabilities [Member]
Commodity Contracts
Electricity physical forwards	140,000,000	93,000,000
Natural gas financial swaps	23,000,000	8,000,000
Financial swaps - electricity	1,000,000	0
Total commodity contracts	$ 164,000,000	$ 101,000,000

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 30
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-30

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 31
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-31

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
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-Section 50
-Paragraph 32
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-32

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