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Related Party Transactions - PacifiCorp (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
PacifiCorp [Member] | Affiliated Entity [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party 10 10 10
Due to Affiliate, Current 2 2  
Related Party Transaction, Expense Reimbursement 4 7 10
Due from Affiliate, Current 1    
PacifiCorp [Member] | Subsidiary of Common Parent [Member]      
Related Party Transaction [Line Items]      
Due to Affiliate, Current 1 1  
Purchases from Related Party 7 8 7
Revenue from Related Parties 1 2 5
PacifiCorp [Member] | BNSF Railway Company [Member]      
Related Party Transaction [Line Items]      
Due to Affiliate, Current 1 1  
Purchases from Related Party 37 39 39
PacifiCorp [Member] | MEHC Insurance Services Ltd. [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Proceeds From Insurance Claims 0 2 0
PacifiCorp [Member] | BHE [Member]      
Related Party Transaction [Line Items]      
Income Taxes Receivable From (Payable To) Related Parties Current 17 17  
Related Party Transaction, Cash Received for Income Taxes, Net (201) (40) (161)
PacifiCorp [Member] | Bridger Coal Company [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Expense Reimbursement 2 19 3
Due from Affiliate, Current 5 4  
PacifiCorp [Member] | Equity Method Investee [Member]      
Related Party Transaction [Line Items]      
Due to Affiliate, Current 17 16  
Purchases from Related Party $ 174 $ 181 $ 146