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Income Taxes - MidAmerican Funding (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]          
Federal statutory income tax rate 21.00% 35.00% 21.00% 35.00% 35.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent (78.00%) (19.00%) (58.00%) (17.00%)  
State income tax, net of federal income tax benefit 19.00% (1.00%) 25.00% 2.00%  
Effects of ratemaking (8.00%) (0.00%) (8.00%) (0.00%)  
Other, net 1.00% (0.00%) (1.00%) (1.00%)  
Effective income tax rate 86.00% (13.00%) 81.00% (11.00%)  
Production Tax Credit Carryforwards [Abstract]          
Years eligible for federal renewable energy production tax credit     10 years    
Related Party Income Tax Receivable (Payable) [Abstract]          
Related party transaction, cash received for income taxes, net     $ 311    
MidAmerican Funding, LLC and Subsidiaries [Domain]          
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]          
Federal statutory income tax rate 21.00% 35.00% 21.00% 35.00% 35.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent (86.00%) (71.00%) (113.00%) (78.00%)  
State income tax, net of federal income tax benefit (8.00%) (5.00%) (9.00%) (2.00%)  
Effects of ratemaking (10.00%) (5.00%) (14.00%) (8.00%)  
Other, net (1.00%) (0.00%) (0.00%) (0.00%)  
Effective income tax rate (84.00%) (46.00%) (115.00%) (53.00%)  
Production Tax Credit Carryforwards [Abstract]          
Years eligible for federal renewable energy production tax credit     10 years    
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     $ 234 $ 8  
Iowa Senate File 2417, Rate Effective Starting 2021 [Member]          
Related Party Income Tax Receivable (Payable) [Abstract]          
Deferred Tax Liabilities, Net $ 61   61    
Deferred Income Tax Expense (Benefit)     2    
Iowa Senate File 2417, Rate Effective Starting 2021 [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain]          
Related Party Income Tax Receivable (Payable) [Abstract]          
Deferred Tax Liabilities, Net 54   54    
Deferred Income Tax Expense (Benefit)     $ 2    
Tax Cuts and Jobs Act of 2017 [Member]          
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]          
Federal statutory income tax rate     21.00%    
Tax Cuts and Jobs Act of 2017 [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain]          
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]          
Federal statutory income tax rate     21.00%    
Deferred Income Taxes [Member] | Iowa Senate File 2417, Rate Effective Starting 2021 [Member]          
Related Party Income Tax Receivable (Payable) [Abstract]          
Regulatory Liabilities 59   $ 59    
Deferred Income Taxes [Member] | Iowa Senate File 2417, Rate Effective Starting 2021 [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain]          
Related Party Income Tax Receivable (Payable) [Abstract]          
Regulatory Liabilities $ 56   $ 56    
IOWA | Maximum [Member] | Iowa Senate File 2417, Rate Effective Starting 2021 [Member]          
Related Party Income Tax Receivable (Payable) [Abstract]          
Statutory Income Tax Rate, State and Local, Percent     9.80%    
IOWA | Maximum [Member] | Tax Year, Current [Member]          
Related Party Income Tax Receivable (Payable) [Abstract]          
Statutory Income Tax Rate, State and Local, Percent     12.00%