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Related Party Transactions Related Party Transactions - MEC (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
MidAmerican Energy Company [Member] | Affiliated Entity [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Expense Reimbursement 46 58 38
Due from Affiliate, Current 5 12  
Due to Affiliate, Current 13 12  
Due from Affiliate, Noncurrent 10 13  
Due to Affiliate, Noncurrent 29 30  
MidAmerican Energy Company [Member] | BHE [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Expenses from Transactions with Related Party 7 8 10
Income Taxes Receivable From (Payable To) Related Parties Current 102 299  
Related Party Transaction, Cash Received for Income Taxes, Net 629 149 36
MidAmerican Energy Company [Member] | Northern Natural Gas and BNSF Railway Company [Member]      
Related Party Transaction [Line Items]      
Purchases from Related Party $ 165 $ 144 $ 155