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Related Party Transactions Related Party Transactions - MEC (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
MidAmerican Energy Company [Member] | Affiliated Entity [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Expense Reimbursement 53 41 46
Due from Affiliate, Current 9 5  
Due to Affiliate, Current 16 13  
Due from Affiliate, Noncurrent 16 12  
Due to Affiliate, Noncurrent 45 36  
MidAmerican Energy Company [Member] | BHE [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Expenses from Transactions with Related Party 9 6 7
Income Taxes Receivable From (Payable To) Related Parties Current 51 (6)  
Related Party Transaction, Cash Received for Income Taxes, Net 465 601 629
MidAmerican Energy Company [Member] | Northern Natural Gas and BNSF Railway Company [Member]      
Related Party Transaction [Line Items]      
Purchases from Related Party $ 122 $ 135 $ 165