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Related Party Transactions - NPC (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]      
Related Party Transaction, Cash Received for Income Taxes, Net $ 900 $ 900 $ 636
Nevada Power Company [Member] | Berkshire Hathaway Energy [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party 2 2 2
Nevada Power Company [Member] | Kern River [Member]      
Related Party Transaction [Line Items]      
Purchases from Related Party 52 58 66
Due to Affiliate 4 4  
Nevada Power Company [Member] | Sierra Pacific Power Company [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party 14 15 17
Due to Affiliate 0 0  
Due from Affiliates 3 5  
Related Party Transaction, Expense Reimbursement 26 28 27
Nevada Power Company [Member] | NV Energy, Inc. [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party 9 7 10
Due to Affiliate 26 26  
Due from Affiliates 0 0  
Related Party Transaction, Expense Reimbursement 0 1 0
Income Taxes Receivable From (Payable To) Related Parties Current 7 (4)  
Related Party Transaction, Cash Received for Income Taxes, Net 113 117 89
Nevada Power Company [Member] | Electric Distribution [Member] | PacifiCorp [Member]      
Related Party Transaction [Line Items]      
Purchases from Related Party 0 0 0
Due to Affiliate 0 0  
Revenue from Related Parties 2 3 3
Due from Affiliates 0 0  
Nevada Power Company [Member] | Electric Distribution [Member] | Sierra Pacific Power Company [Member]      
Related Party Transaction [Line Items]      
Purchases from Related Party 25 28 21
Due to Affiliate 1 1  
Revenue from Related Parties 84 91 $ 104
Due from Affiliates $ 5 $ 6