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Income Taxes - Reconciliation of Uncertain Tax Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Uncertain tax benefits      
Uncertain tax benefits $ 22 $ 13 $ 15
Liability for uncertainty in income taxes, noncurrent 24 14  
Unrecognized tax benefits, income tax penalties expense 1   1
Accrued interest and penalties related to unrecognized tax benefits 2 1  
Uncertain tax benefits reconciliation      
Balance as of January 1 13 15  
Increase due to current year positions 9 4  
Increase due to acquired balance from Direct Energy 0 9  
Settlements, payments and statute closure 0 (15)  
Uncertain tax benefits as of December 31 $ 22 $ 13 $ 15