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Regulatory Matters - NPC - Narrative (Details) - NPC - Public Utilities Commission, Nevada - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Oct. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2021
General Rate Case          
Public Utilities, General Disclosures [Line Items]          
Filing supported rate decrease     $ 96    
Requested rate increase (decrease)     $ (120)    
Approved rate increase (decrease)   $ (93)      
One-time bill credit $ 120     $ 120  
Energy Efficiency Rate Case          
Public Utilities, General Disclosures [Line Items]          
Customer refund liability       $ 8 $ 8