v3.25.3
Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Income Tax Contingency [Line Items]        
Effective income tax rate (as a percent) (2.00%) 21.00% 14.00% 18.00%
Deferred tax, state, benefit $ 74     $ 74
Interest and penalties on uncertain tax liability 30   $ 30  
Increase in unrecognized tax benefits is reasonably possible as a result of a lapse in statutes $ 11   $ 11  
Houston Electric        
Income Tax Contingency [Line Items]        
Effective income tax rate (as a percent) 18.00% 19.00% 19.00% 19.00%
CERC        
Income Tax Contingency [Line Items]        
Effective income tax rate (as a percent) (222.00%) 21.00% 11.00% 20.00%
Deferred tax, state, benefit $ 73     $ 73