Fair Value of Financial Instruments Fair Value Options Quantitative Disclosure (Details) - USD ($)	Sep. 30, 2022	Dec. 31, 2021
Low [Member]
Commodity Contracts
Electricity physical forwards	$ 26.74	$ 16.66
Natural gas financial swaps	2.86	2.02
Financial swaps - electricity	37.94	26.76
High [Member]
Commodity Contracts
Electricity physical forwards	176.00	129.75
Natural gas financial swaps	6.94	8.02
Financial swaps - electricity	103.00	68.43
Weighted Average [Member]
Commodity Contracts
Electricity physical forwards	71.44	43.73
Natural gas financial swaps	3.52	2.81
Financial swaps - electricity	81.94	52.46
Assets [Member]
Commodity Contracts
Electricity physical forwards	5,000,000	0
Natural gas financial swaps	28,000,000	5,000,000
Financial swaps - electricity	11,000,000	1,000,000
Total commodity contracts	44,000,000	6,000,000
Liabilities [Member]
Commodity Contracts
Electricity physical forwards	69,000,000	90,000,000
Natural gas financial swaps	5,000,000	1,000,000
Financial swaps - electricity	0	0
Total commodity contracts	$ 74,000,000	$ 91,000,000