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Income Taxes - MidAmerican Funding (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]        
Federal statutory income tax rate 21.00% 21.00% 21.00% 21.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent (29.00%) (78.00%) (29.00%) (58.00%)
State income tax, net of federal income tax benefit (0.00%) (19.00%) (8.00%) (25.00%)
Effects of ratemaking (2.00%) (8.00%) (2.00%) (8.00%)
Other, net (1.00%) 1.00% (0.00%) (1.00%)
Effective income tax rate 12.00% 86.00% 20.00% 81.00%
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% 21.00% 21.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent (171.00%) (86.00%) (139.00%) (113.00%)
State income tax, net of federal income tax benefit (25.00%) (8.00%) (23.00%) (9.00%)
Effects of ratemaking (11.00%) (10.00%) (9.00%) (14.00%)
Other, net 3.00% (1.00%) (0.00%) (0.00%)
Effective income tax rate (183.00%) (84.00%) (150.00%) (115.00%)
Production Tax Credit Carryforwards [Abstract]        
Years eligible for federal renewable energy production tax credit     10 years  
Recognized production tax credits     $ 190 $ 108
MidAmerican Funding, LLC and Subsidiaries [Domain] | Berkshire Hathaway Energy [Member]        
Related Party Income Tax Receivable (Payable) [Abstract]        
Related party transaction, cash (paid) received for income taxes, net     (8) $ 234
Production Tax Credit Recognition [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain]        
Production Tax Credit Carryforwards [Abstract]        
Recognized production tax credits     $ 56