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Income Taxes - MEC (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]    
Federal statutory income tax rate 21.00% 21.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent (46.00%) (29.00%)
State income tax, net of federal income tax benefit (0.00%) (17.00%)
Effects of ratemaking (8.00%) (3.00%)
Other, net 1.00% 2.00%
Effective income tax rate 36.00% 30.00%
Production Tax Credit Carryforwards [Abstract]    
Years eligible for federal renewable energy production tax credit 10 years  
MidAmerican Energy Company [Member]    
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]    
Federal statutory income tax rate 21.00% 21.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent (430.00%) (113.00%)
State income tax, net of federal income tax benefit (28.00%) (21.00%)
Effects of ratemaking (3.00%) (8.00%)
Other, net 1.00% (1.00%)
Effective income tax rate (439.00%) (122.00%)
Production Tax Credit Carryforwards [Abstract]    
Years eligible for federal renewable energy production tax credit 10 years  
MidAmerican Energy Company [Member] | Berkshire Hathaway Energy [Member]    
Related Party Income Tax Receivable (Payable) [Abstract]    
Related party transaction, cash (paid) received for income taxes, net $ (46) $ 0