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Related Party Transactions - Summary of Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
May 26, 2020
Mar. 09, 2020
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]          
Dividends declared per share (in dollars per share)     $ 0    
Dividend Per Share (in dollars per share) $ 0.40 $ 0.80 $ 0 $ 0.80 $ 1.20
Dividends Paid $ 40 $ 80 $ 0 $ 80 $ 121
CVR Partners          
Related Party Transaction [Line Items]          
Distributions declared (in dollars per share)     $ 0    
Distributions paid (in dollars per share)     $ 0    
IEP          
Related Party Transaction [Line Items]          
Dividends Paid 28 57 $ 0 $ 57 85
Stockholders          
Related Party Transaction [Line Items]          
Dividends Paid $ 12 $ 23     $ 35