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Income Taxes - Schedule of Reconciliation of the U.S. Federal Statutory Rate (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Tax Credit Carryforward [Line Items]      
Loss Before Income Taxes $ (33) $ (16) $ 1,282
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Tax at 21% (7) (3) 269
State taxes, net of federal benefit 6 (2) 58
Tax credits (4)    
State taxes assessed at subsidiaries   (3) 2
HLBV impact 32    
Employee share-based payments 2    
Other 1 (2) (2)
Impact of non-taxable partnership earnings (losses)   21 (101)
Valuation allowance   3 0
Investment tax credits   (1) 0
Production tax credits   (16) (2)
Rate change   1 (2)
Income tax expense (benefit) $ 30 $ (2) $ 222
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Tax at 21% 21.00%    
State taxes, net of federal benefit (18.20%)    
Tax credits 12.10%    
HLBV impact (96.90%)    
Employee share-based payments (6.00%)    
Other (2.90%)    
Effective income tax rate (90.90%) 12.50% 17.30%
Alta TE Holdco LLC      
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Income tax expense (benefit)   $ 14