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Related Party Transactions - PacifiCorp (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Related Party Transaction [Line Items]      
Income Taxes Receivable From (Payable To) Related Parties Current $ 286 $ 1,100  
Related Party Transaction, Cash Received for Income Taxes, Net 1,800 764 $ 1,200
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 17
Due to Affiliate, Current 2 1  
Related Party Transaction, Expense Reimbursement 7 10 9
Due from Affiliate, Current 1 7  
PacifiCorp [Member] | Subsidiary of Common Parent [Member]      
Related Party Transaction [Line Items]      
Due to Affiliate, Current 1 1  
Purchases from Related Party 8 7 5
Revenue from Related Parties 2 5 0
PacifiCorp [Member] | BNSF Railway Company [Member]      
Related Party Transaction [Line Items]      
Due to Affiliate, Current 1 3  
Purchases from Related Party 39 39 32
PacifiCorp [Member] | MEHC Insurance Services Ltd. [Member]      
Related Party Transaction [Line Items]      
Due from Affiliate, Current 0 2  
Related Party Transaction, Proceeds From Insurance Claims 2 0 1
PacifiCorp [Member] | BHE [Member]      
Related Party Transaction [Line Items]      
Income Taxes Receivable From (Payable To) Related Parties Current 17 133  
Related Party Transaction, Cash Received for Income Taxes, Net (40) (161) (120)
PacifiCorp [Member] | Bridger Coal Company [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Expense Reimbursement 19 3 2
Due from Affiliate, Current 4 4  
PacifiCorp [Member] | Equity Method Investee [Member]      
Related Party Transaction [Line Items]      
Due to Affiliate, Current 16 19  
Purchases from Related Party $ 181 $ 146 $ 152