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Income Taxes - SPPC - Reconciliation of Effective Income Tax Rate (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Effective Income Tax Rate Reconciliation [Line Items]      
Federal statutory income tax rate 35.00% 35.00% 35.00%
Other, net (2.00%) (2.00%) (2.00%)
Effective income tax rate 14.00% 16.00% 23.00%
Sierra Pacific Power Company [Member]      
Schedule of Effective Income Tax Rate Reconciliation [Line Items]      
Federal statutory income tax rate 35.00% 35.00% 35.00%
Effective Income Tax Rate Reconciliation Regulatory Differences 1.00% 1.00% 1.00%
Other, net 1.00% 0.00% (1.00%)
Effective income tax rate 37.00% 36.00% 35.00%