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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Business Acquisition [Line Items]    
Deferred tax assets, valuation allowance $ 10 $ 11
Accrued penalties and interest 28  
Unrecognized tax benefits that would impact effective tax rate 26  
Accrued penalties and interest not included 2  
State and Local Jurisdiction    
Business Acquisition [Line Items]    
Operating loss carryforwards 1,100  
Deferred tax assets tax credit carryforwards 17  
State and Local Jurisdiction | CERC Corp    
Business Acquisition [Line Items]    
Operating loss carryforwards 827  
Deferred tax assets tax credit carryforwards 17  
Domestic Tax Authority | CERC Corp    
Business Acquisition [Line Items]    
Deferred tax assets tax credit carryforwards $ 1,800