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Income Taxes Income Taxes - MidAmerican Funding - Reconciliation of Effective Income Tax Rate (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule of Effective Income Tax Rate Reconciliation [Line Items]      
Federal statutory income tax rate 21.00% 21.00% 35.00%
Income tax credits (32.00%) (30.00%) (20.00%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 5.00% 6.00% (3.00%)
Effective Income Tax Rate Reconciliation Regulatory Differences (6.00%) (8.00%) (1.00%)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent (0.00%) (4.00%) (31.00%)
Other, net (1.00%) (1.00%) (1.00%)
Effective income tax rate (25.00%) (30.00%) (22.00%)
Years Eligible For Renewable Energy Production Tax Credit 10 years    
MidAmerican Funding, LLC and Subsidiaries [Domain]      
Schedule of Effective Income Tax Rate Reconciliation [Line Items]      
Federal statutory income tax rate 21.00% 21.00% 35.00%
Income tax credits (94.00%) (76.00%) (77.00%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent (12.00%) (4.00%) (6.00%)
Effective Income Tax Rate Reconciliation Regulatory Differences (8.00%) (6.00%) (8.00%)
Other, net 0.00% 1.00% 2.00%
Effective income tax rate (93.00%) (64.00%) (54.00%)
Years Eligible For Renewable Energy Production Tax Credit 10 years    
Tax Cuts and Jobs Act of 2017 [Member]      
Schedule of Effective Income Tax Rate Reconciliation [Line Items]      
Federal statutory income tax rate 21.00% 21.00%