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Related-Party Transactions - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 26, 2021
Jan. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]              
Dividends declared in common shares             12,000,000
Royal Oak Enterprises [Member]              
Related Party Transaction [Line Items]              
Net revenues from related party         $ 5    
Accounts receivable from related party     $ 2   $ 2    
Series B Preferred Shares [Member]              
Related Party Transaction [Line Items]              
Number of shares sold 800,000            
Aggregate purchase price $ 800            
Series B Preferred Shares [Member] | Viking Purchasers [Member]              
Related Party Transaction [Line Items]              
Number of shares sold         200,000    
Aggregate purchase price         $ 200    
Series B Preferred Shares [Member] | Viking Purchasers [Member] | Minimum [Member]              
Related Party Transaction [Line Items]              
Percentage of outstanding stock owned by related party under agreement         5.00%    
Mariposa Acquisition I V L L C [Member]              
Related Party Transaction [Line Items]              
Advisory service fees payable     $ 1 $ 1 $ 3 $ 3  
Preferred Stock [Member] | Mariposa Acquisition I V L L C [Member]              
Related Party Transaction [Line Items]              
Dividends declared in common shares   12,400,000