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Related Party Transactions - NPC (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Related Party Transaction [Line Items]      
Income Taxes Receivable From (Payable To) Related Parties Current $ 27 $ 286  
Related Party Transaction, Cash Received for Income Taxes, Net 1,100 1,800 $ 764
Nevada Power Company [Member] | Kern River [Member]      
Related Party Transaction [Line Items]      
Purchases from Related Party   68 68
Nevada Power Company [Member] | Sierra Pacific Power Company [Member]      
Related Party Transaction [Line Items]      
Due from Affiliates   6  
Due to Affiliate 0 0  
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party   16 16
Related Party Transaction, Expense Reimbursement 24    
Nevada Power Company [Member] | NV Energy, Inc. [Member]      
Related Party Transaction [Line Items]      
Due from Affiliates 0 0  
Due to Affiliate 32    
Related Party Transaction, Expense Reimbursement 1 1 1
Nevada Power Company [Member] | BHE [Member]      
Related Party Transaction [Line Items]      
Income Taxes Receivable From (Payable To) Related Parties Current 68 0  
Related Party Transaction, Cash Received for Income Taxes, Net 0 0 0
Nevada Power Company [Member] | Electric Distribution [Member] | PacifiCorp [Member]      
Related Party Transaction [Line Items]      
Purchases from Related Party 0 2  
Due from Affiliates 0 0  
Due to Affiliate   0  
Nevada Power Company [Member] | Electric Distribution [Member] | Sierra Pacific Power Company [Member]      
Related Party Transaction [Line Items]      
Purchases from Related Party 17    
Revenue from Related Parties   69 $ 33
Due from Affiliates   15  
Due to Affiliate $ 12 $ 1