Fair Value of FInancial Instruments Fair Value Options Quantitative Disclosure (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Minimum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Electricity physical forward purchase	$ 16.66	$ 11.17
Natural gas financial swaps	2.02	1.52
Fnancial swaps - electricity	26.76	8.78
Maximum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Electricity physical forward purchase	129.75	51.18
Natural gas financial swaps	8.02	4.33
Fnancial swaps - electricity	68.43	58.42
Weighted Average [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Electricity physical forward purchase	43.73	29.74
Natural gas financial swaps	2.81	2.29
Fnancial swaps - electricity	52.46	43.71
Assets [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Electricity physical forward purchase	0	0
Natural gas financial swaps	5,000,000	1,000,000
Fnancial swaps - electricity	1,000,000	4,000,000
Total commodity contracts	6,000,000	5,000,000
Liabilities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Electricity physical forward purchase	90,000,000	141,000,000
Natural gas financial swaps	1,000,000	1,000,000
Fnancial swaps - electricity	0	0
Total commodity contracts	$ 91,000,000	$ 142,000,000