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Short-Term Debt and Credit Facilities - MEC - Credit Facility (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity [1] $ 9,114 $ 9,051
Short-term Debt [1] (2,516) (4,488)
Line of Credit Facility, Amounts Supported [1] (543) (594)
Line of Credit Facility, Remaining Borrowing Capacity [1] 6,055 3,969
MidAmerican Energy Company [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 1,305 905
Short-term Debt (240) 0
Line of Credit Facility, Amounts Supported (370) (370)
Line of Credit Facility, Remaining Borrowing Capacity $ 695 535
MidAmerican Energy Company [Member] | Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Debt to capitalization ratio 0.65  
MidAmerican Energy Company [Member] | Commercial Paper [Member]    
Line of Credit Facility [Line Items]    
Short-term Debt, Weighted Average Interest Rate, at Point in Time 2.49%  
Regulatory Approval for Additional Short-Term Debt Issuances $ 1,305  
MidAmerican Energy Company [Member] | Unsecured credit facility, $900 million, expiring June 2021 [Member] | Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 900  
MidAmerican Energy Company [Member] | Unsecured 364-day Credit Facility, $5 million, expiring June [Member] | Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 5  
MidAmerican Funding [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 1,309 [2] 909
Short-term Debt (240) 0
Line of Credit Facility, Amounts Supported (370) (370)
Line of Credit Facility, Remaining Borrowing Capacity $ 699 $ 539
MidAmerican Funding [Member] | Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Debt, Weighted Average Interest Rate 2.49%  
Debt to capitalization ratio 0.65  
MidAmerican Funding [Member] | Unsecured credit facility, $400 million, expiring November 2019 [Member] | Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 400  
[1] (1)The table does not include unused credit facilities and letters of credit for investments that are accounted for under the equity method.
[2] (2) Includes the drawn uncommitted credit facilities totaling $39 million at Northern Powergrid.