Fair Value of Financial Instruments Fair Value Options Quantitative Disclosure (Details) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Low [Member]
Commodity Contracts
Electricity physical forwards	$ 20.00	$ 16.66
Natural gas financial swaps	2.55	2.02
Financial swaps - electricity	20.00	26.76
High [Member]
Commodity Contracts
Electricity physical forwards	146.53	129.75
Natural gas financial swaps	5.83	8.02
Financial swaps - electricity	146.53	68.43
Weighted Average [Member]
Commodity Contracts
Electricity physical forwards	51.04	43.73
Natural gas financial swaps	3.08	2.81
Financial swaps - electricity	58.40	52.46
Assets [Member]
Commodity Contracts
Electricity physical forwards	0	0
Natural gas financial swaps	18,000,000	5,000,000
Financial swaps - electricity	1,000,000	1,000,000
Total commodity contracts	19,000,000	6,000,000
Liabilities [Member]
Commodity Contracts
Electricity physical forwards	70,000,000	90,000,000
Natural gas financial swaps	0	1,000,000
Financial swaps - electricity	1,000,000	0
Total commodity contracts	$ 71,000,000	$ 91,000,000