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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2020
Mar. 27, 2020
Dec. 31, 2019
Effective tax rate 50.10% 15.70% 21.20% 7.50%      
U.S. Federal income tax rate     21.00%        
Deferred tax assets, valuation allowance $ 3   $ 3        
Operating loss carryforwards limitations     The foreign net operating losses have carryback periods of three years, carryforward periods of twenty years and begin to expire in 2034.        
Unrecognized tax benefits 2   $ 2       $ 4
Income tax penalties and interest accrued 1   1       $ 1
Income tax interest expense 0 $ 0 $ 0 $ 0      
Interest deduction percentage     30.00% 50.00%      
Forecast [Member]              
Effective income tax rate reconciliation, unrecognized tax benefits         $ 1    
Domestic Tax Authority [Member]              
Operating loss carryforwards $ 228   $ 228        
Operating loss carryforwards limitations     The federal net operating losses have carryback periods of five years that can offset 100% of taxable income for periods in which the Company was a “C” Corporation and can be carried forward indefinitely. The carryforwards will be able to offset 80% of future taxable income for years beginning after 2020.        
Operating loss carryback term     5 years        
Operating loss carryforwards offset percentage 80.00%   80.00%     100.00% 100.00%
State and Local Jurisdiction [Member]              
Operating loss carryforwards $ 0   $ 0        
Foreign Tax Authority [Member]              
Operating loss carryforwards $ 5   $ 5        
Operating loss carryback term     3 years        
Operating loss carryforwards, carryback term     20 years        
Operating loss carryforwards expiration year     2034