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Fair Value of Financial Instruments Fair Value Options Quantitative Disclosure (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023
Low [Member]
Commodity Contracts
Electricity physical forwards	$ 23.00	$ 37.53
Natural gas financial swaps	1.88	2.25
Financial swaps - electricity	48.00	65.30
High [Member]
Commodity Contracts
Electricity physical forwards	114.15	153.33
Natural gas financial swaps	3.51	8.89
Financial swaps - electricity	120.00	107.31
Weighted Average [Member]
Commodity Contracts
Electricity physical forwards	69.61	84.58
Natural gas financial swaps	2.42	3.37
Financial swaps - electricity	80.28	91.33
Assets [Member]
Commodity Contracts
Electricity physical forwards	0	14,000,000
Natural gas financial swaps	0	0
Financial swaps - electricity	0	0
Total commodity contracts	0	14,000,000
Liabilities [Member]
Commodity Contracts
Electricity physical forwards	23,000,000	43,000,000
Natural gas financial swaps	32,000,000	16,000,000
Financial swaps - electricity	7,000,000	0
Total commodity contracts	$ 62,000,000	$ 59,000,000

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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
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-32

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