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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Business Acquisition [Line Items]    
Deferred tax assets, valuation allowance $ 10 $ 10
Accrued penalties and interest 29  
Unrecognized tax benefits that would impact effective tax rate 25  
Accrued penalties and interest not included 4  
Decrease in unrecognized tax benefits, including penalties and interest, in the next 12 months 3  
State and Local Jurisdiction    
Business Acquisition [Line Items]    
Operating loss carryforwards 1,000  
Deferred tax assets tax credit carryforwards 2  
State and Local Jurisdiction | CERC Corp    
Business Acquisition [Line Items]    
Operating loss carryforwards 657  
Deferred tax assets tax credit carryforwards 2  
Domestic Tax Authority | CERC Corp    
Business Acquisition [Line Items]    
Deferred tax assets tax credit carryforwards $ 931,000