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Related Party Transactions Related Party Transactions - MEC (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]      
Related Party Transaction, Cash Received for Income Taxes, Net $ 900 $ 900 $ 636
MidAmerican Energy Company [Member] | Affiliated Entity [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Expense Reimbursement 43 51 53
Due from Affiliate, Current 6 8  
Due to Affiliate, Current 11 12  
Due from Affiliate, Noncurrent 23 20  
Due to Affiliate, Noncurrent 47 36  
MidAmerican Energy Company [Member] | BHE [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Proceeds From Transfer of Asset 15    
Related Party Transaction, Expenses from Transactions with Related Party 14 11 9
Income Taxes Receivable From (Payable To) Related Parties Current (82) (156)  
Related Party Transaction, Cash Received for Income Taxes, Net 450 494 465
MidAmerican Energy Company [Member] | Northern Natural Gas and BNSF Railway Company [Member]      
Related Party Transaction [Line Items]      
Purchases from Related Party $ 139 $ 127 $ 122