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Derivative Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of effect of derivatives in our consolidated statements of operations
The effect of derivatives in our consolidated statements of operations is shown in the table below.
 Gain (loss) recognized in income
  Year ended December 31,
Location202120202019
  (in millions)
Natural gas derivatives
Unrealized net (losses) gainsCost of sales$(25)$6 $(14)
Realized net gains (losses) Cost of sales1 (13)4 
Gain on net settlement of natural gas derivatives due to Winter Storm UriCost of sales112 — — 
Net derivative gains (losses) $88 $(7)$(10)
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, 2021 and 2020, none of our derivative instruments were designated as hedging instruments. See Note 10—Fair Value Measurements for additional information on derivative fair values.
Asset DerivativesLiability Derivatives
 Balance Sheet
Location		December 31,Balance Sheet
Location		December 31,
 2021202020212020
  (in millions) (in millions)
Natural gas derivativesOther current assets$16 $1 Other current liabilities$(47)$(7)
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, 2021 and 2020:
 
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, 2021    
Total derivative assets$16 $— $— $16 
Total derivative liabilities(47)— — (47)
Net derivative liabilities$(31)$— $— $(31)
December 31, 2020    
Total derivative assets$1 $— $— $1 
Total derivative liabilities(7)— — (7)
Net derivative liabilities$(6)$— $— $(6)
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(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, 2021 and 2020:
 
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, 2021    
Total derivative assets$16 $— $— $16 
Total derivative liabilities(47)— — (47)
Net derivative liabilities$(31)$— $— $(31)
December 31, 2020    
Total derivative assets$1 $— $— $1 
Total derivative liabilities(7)— — (7)
Net derivative liabilities$(6)$— $— $(6)
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(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.