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Income Taxes Income Taxes - SPPC (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Schedule of Effective Income Tax Rate Reconciliation [Line Items]        
Federal statutory income tax rate 21.00% 21.00% 21.00% 21.00%
Effects of ratemaking (2.00%) (8.00%) (2.00%) (8.00%)
Other, net 1.00% (1.00%) 0.00% 1.00%
Effective income tax rate 12.00% 86.00% 20.00% 81.00%
Sierra Pacific Power Company [Member]        
Schedule of Effective Income Tax Rate Reconciliation [Line Items]        
Federal statutory income tax rate 21.00% 21.00% 21.00% 21.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent 0.00% 8.00% 0.00% 3.00%
Effects of ratemaking (1.00%) (14.00%) (1.00%) 1.00%
Other, net 0.00% 3.00% 0.00% 0.00%
Effective income tax rate 22.00% 46.00% 22.00% 23.00%