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Related Party Transactions Related Party Transactions - MEC (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]      
Related Party Transaction, Cash Received for Income Taxes, Net $ 900 $ 600 $ 1,053
MidAmerican Energy Company [Member] | Affiliated Entity [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Expense Reimbursement 51 53 41
Due from Affiliate, Current 8 9  
Due to Affiliate, Current 12 16  
Due from Affiliate, Noncurrent 20 16  
Due to Affiliate, Noncurrent 36 45  
MidAmerican Energy Company [Member] | BHE [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Proceeds From Transfer of Asset 15    
MidAmerican Energy Company [Member] | BHE [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Expenses from Transactions with Related Party 11 9 6
Income Taxes Receivable From (Payable To) Related Parties Current (156) 51  
Related Party Transaction, Cash Received for Income Taxes, Net 494 465 601
MidAmerican Energy Company [Member] | Northern Natural Gas and BNSF Railway Company [Member]      
Related Party Transaction [Line Items]      
Purchases from Related Party $ 127 $ 122 $ 135