Income Taxes (Details) - USD ($)		1 Months Ended	3 Months Ended
		Jan. 31, 2021	Mar. 31, 2021	Mar. 31, 2020	[1]	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits, Income Tax Penalties Accrued			$ 0			$ 0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%	21.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent			6.20%	6.20%
Effective Income Tax Rate Reconciliation, Other Regulatory Items, Percent	[2]		(5.10%)	(22.00%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amortization, Percent			0.00%	(14.70%)
Regulatory difference - tax credits and tax credit and NOL allowances (net)			(1.10%)	(1.70%)
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent			1.00%	1.50%
Effective Income Tax Rate Reconciliation, Percent			22.00%	(9.70%)
Tax Audits [Abstract]
Potential Tax Adjustments		$ 0	$ 0

[1] Prior periods have been restated to conform to current year presentation.

[2] Regulatory differences for income tax primarily relates to the credit of excess deferred taxes to customers through the average rate assumption method. Income tax benefits associated with the credit of excess deferred credits are offset by corresponding revenue reductions.