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Related Party Transactions Related Party Transactions - MEC (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
MidAmerican Energy Company [Member] | Affiliated Entity [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Expense Reimbursement 41 46 58
Due from Affiliate, Current 5 5  
Due to Affiliate, Current 13 13  
Due from Affiliate, Noncurrent 12 10  
Due to Affiliate, Noncurrent 36 29  
MidAmerican Energy Company [Member] | BHE [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Expenses from Transactions with Related Party 6 7 8
Income Taxes Receivable From (Payable To) Related Parties Current (6) 102  
Related Party Transaction, Cash Received for Income Taxes, Net 601 629 149
MidAmerican Energy Company [Member] | Northern Natural Gas and BNSF Railway Company [Member]      
Related Party Transaction [Line Items]      
Purchases from Related Party $ 135 $ 165 $ 144