Income Taxes - SPPC - Reconciliation of Effective Income Tax Rate (Details)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%	21.00%	35.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	0.00%	4.00%	31.00%
Effective income tax rate	(25.00%)	(30.00%)	(22.00%)
Sierra Pacific Power Company [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%	21.00%	35.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent	0.00%	4.00%	0.00%
Effective income tax rate	21.00%	25.00%	34.00%
Tax Cuts and Jobs Act of 2017 [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%	21.00%
Tax Cuts and Jobs Act of 2017 [Member] \| Sierra Pacific Power Company [Member]
Schedule of Effective Income Tax Rate Reconciliation [Line Items]
Federal statutory income tax rate	21.00%		35.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	0.00%	0.00%	(1.00%)

Schedule of Effective Income Tax Rate Reconciliation [Line Items]

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates.

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