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Regulatory Matters Regulatory Matters - NPC (Details)
$ in Millions
1 Months Ended
May 31, 2017
USD ($)
Mar. 31, 2017
USD ($)
MW
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Schedule Of Regulatory Assets and Liabilities [Line Items]          
Regulatory assets       $ 4,582 $ 4,307
Nevada Power Company [Member]          
Schedule Of Regulatory Assets and Liabilities [Line Items]          
Regulatory assets       $ 1,110 $ 1,000
Nevada Power Company [Member] | 257 Megawatts of Coal Energy [Member]          
Schedule Of Regulatory Assets and Liabilities [Line Items]          
Coal-Fired Power Plant Capacity | MW   257      
Regulatory assets   $ 151      
Nevada Power Company [Member] | Public Utilities Commission, Nevada [Member] | MGM Resorts International [Member]          
Schedule Of Regulatory Assets and Liabilities [Line Items]          
Total impact fee     $ 82    
Impact Fee Credit $ 16        
Nevada Power Company [Member] | Public Utilities Commission, Nevada [Member] | Wynn Las Vegas, LLC [Member]          
Schedule Of Regulatory Assets and Liabilities [Line Items]          
Total impact fee     $ 15    
Nevada Power Company [Member] | Public Utilities Commission, Nevada [Member] | Switch, Ltd. [Member]          
Schedule Of Regulatory Assets and Liabilities [Line Items]          
Total impact fee $ 27