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Related Party Transactions - PacifiCorp (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Related Party Transaction [Line Items]      
Income Taxes Receivable From (Payable To) Related Parties Current $ 334 $ (27)  
Related Party Transaction, Cash Received for Income Taxes, Net 600 1,100 $ 1,781
PacifiCorp [Member] | Affiliated Entity [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party 11 10 10
Due to Affiliate, Current 2   2
Related Party Transaction, Expense Reimbursement 3 4 7
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 6 7 8
Revenue from Related Parties 1 1 2
PacifiCorp [Member] | BNSF Railway Company [Member]      
Related Party Transaction [Line Items]      
Due to Affiliate, Current 3 1  
Purchases from Related Party 35 37 39
PacifiCorp [Member] | MEHC Insurance Services Ltd. [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Proceeds From Insurance Claims 0 0 2
PacifiCorp [Member] | BHE [Member]      
Related Party Transaction [Line Items]      
Income Taxes Receivable From (Payable To) Related Parties Current 59 17  
Related Party Transaction, Cash Received for Income Taxes, Net (340) (201) (40)
PacifiCorp [Member] | Bridger Coal Company [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Expense Reimbursement 2 2 19
Due from Affiliate, Current 5    
PacifiCorp [Member] | Equity Method Investee [Member]      
Related Party Transaction [Line Items]      
Due to Affiliate, Current 18 17  
Purchases from Related Party $ 170 $ 174 $ 181