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Income Taxes Income Taxes - NPC (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%
Effective Income Tax Rate Reconciliation Regulatory Differences 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%
Nevada 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% 2.00% 0.00% 2.00%
Effective Income Tax Rate Reconciliation Regulatory Differences 0.00% (1.00%) 0.00% (1.00%)
Other, net 0.00% 1.00% 0.00% 1.00%
Effective income tax rate 21.00% 23.00% 21.00% 23.00%