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Income Tax - Additional Information (Details) - USD ($)
$ in Millions
6 Months Ended
Dec. 31, 2020
Jun. 30, 2020
Income Tax [Line Items]    
Federal net operating loss carryforwards   $ 1,500
Operating loss carryforward for state income tax   $ 203
Minimum | Federal    
Income Tax [Line Items]    
Operating loss carryforwards expiration period 2021  
Minimum | State    
Income Tax [Line Items]    
Operating loss carryforwards expiration period 2029  
Maximum | Federal    
Income Tax [Line Items]    
Operating loss carryforwards expiration period 2037  
Maximum | State    
Income Tax [Line Items]    
Operating loss carryforwards expiration period 2038