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Derivative Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of effect of derivatives in our consolidated statements of operations
The effect of derivatives on our consolidated statements of operations is shown in the table below.
 Gain (loss) recognized in income
  Year ended December 31,
Location202520242023
 (in millions)
Natural gas derivatives
Unrealized net (losses) gains Cost of sales$(5)$35 $39 
Realized net lossesCost of sales(1)(40)(139)
Net derivative losses $(6)$(5)$(100)
Schedule of fair values of derivatives in our consolidated balance sheet
The fair values of derivatives on our consolidated balance sheets are shown below. As of December 31, 2025 and 2024, none of our derivative instruments were designated as hedging instruments. See Note 9—Fair Value Measurements for additional information on derivative fair values.
Asset DerivativesLiability Derivatives
 Balance Sheet
Location		December 31,Balance Sheet
Location		December 31,
 2025202420252024
  (in millions) (in millions)
Natural gas derivativesOther current assets$— $4 Other current liabilities$(5)$(3)
Natural gas derivativesOther assets1 — Other liabilities— — 
Schedule of amounts relevant to offsetting of derivative assets
The following table presents amounts relevant to offsetting of our derivative assets and liabilities as of December 31, 2025 and 2024:
 
Amounts presented in consolidated
balance sheets(1)
Gross amounts not offset in consolidated balance sheets
 Financial
instruments		Cash collateral received (pledged)Net
amount
 (in millions)
December 31, 2025    
Total derivative assets$1 $— $— $1 
Total derivative liabilities(5)— — (5)
Net derivative liabilities$(4)$— $— $(4)
December 31, 2024    
Total derivative assets$4 $— $— $4 
Total derivative liabilities(3)— — (3)
Net derivative assets$1 $— $— $1 
_______________________________________________________________________________
(1)We report the fair values of our derivative assets and liabilities on a gross basis on our consolidated balance sheets. As a result, the gross amounts recognized and net amounts presented are the same.
Schedule of amounts relevant to offsetting of derivative liabilities
The following table presents amounts relevant to offsetting of our derivative assets and liabilities as of December 31, 2025 and 2024:
 
Amounts presented in consolidated
balance sheets(1)
Gross amounts not offset in consolidated balance sheets
 Financial
instruments		Cash collateral received (pledged)Net
amount
 (in millions)
December 31, 2025    
Total derivative assets$1 $— $— $1 
Total derivative liabilities(5)— — (5)
Net derivative liabilities$(4)$— $— $(4)
December 31, 2024    
Total derivative assets$4 $— $— $4 
Total derivative liabilities(3)— — (3)
Net derivative assets$1 $— $— $1 
_______________________________________________________________________________
(1)We report the fair values of our derivative assets and liabilities on a gross basis on our consolidated balance sheets. As a result, the gross amounts recognized and net amounts presented are the same.