v3.26.1
Income Taxes - LLC - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Schedule of Effective Income Tax Rate Reconciliation [Line Items]      
Related party transaction, cash received (paid) for income taxes $ 0 $ 0  
Effective income tax rate (49.00%) (41.80%)  
Energy-related tax credits $ 564 $ 560  
Income (loss) before tax $ 878 953  
Years eligible for federal renewable energy production tax credit 10 years    
MidAmerican Funding, LLC      
Schedule of Effective Income Tax Rate Reconciliation [Line Items]      
Related party transaction, cash received (paid) for income taxes $ 0 $ 0  
Effective income tax rate (807.40%) 2950.00%  
Energy-related tax credits $ 222 $ 236  
Income (loss) before tax $ 27 $ (8)  
Years eligible for federal renewable energy production tax credit 10 years    
MidAmerican Funding, LLC | Related party      
Schedule of Effective Income Tax Rate Reconciliation [Line Items]      
Current income tax receivable (payable), related parties $ 316   $ 79