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Income Taxes - MidAmerican Funding (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
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 (29.00%) (45.00%)
State income tax, net of federal income tax benefit (17.00%) (30.00%)
Effects of ratemaking (3.00%) (8.00%)
Other, net 2.00% (1.00%)
Effective income tax rate 30.00% 78.00%
Production Tax Credit Carryforwards [Abstract]    
Years eligible for federal renewable energy production tax credit 10 years  
MidAmerican Funding, LLC and Subsidiaries [Domain]    
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 (118.00%) (151.00%)
State income tax, net of federal income tax benefit (22.00%) (10.00%)
Effects of ratemaking (9.00%) (20.00%)
Other, net (1.00%) 2.00%
Effective income tax rate (129.00%) (158.00%)
Production Tax Credit Carryforwards [Abstract]    
Years eligible for federal renewable energy production tax credit 10 years  
Recognized production tax credits $ 98 $ 60
MidAmerican Funding, LLC and Subsidiaries [Domain] | Berkshire Hathaway Energy [Member]    
Related Party Income Tax Receivable (Payable) [Abstract]    
Related party transaction, cash received for income taxes, net   $ 14
Production Tax Credit Recognition [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain]    
Production Tax Credit Carryforwards [Abstract]    
Recognized production tax credits $ 30