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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Operating Loss Carryforwards [Line Items]          
Effective income tax rate 35.10%   6.50% 8.70% 6.60%
Income Tax Benefit Offset Amount From Cares Act 2020 Aid $ 100 $ 123      
Net operating losses carried back term due to cares act       5 years  
Refund claim to carryback net operating loss from Settlement with Taxing Authority 94     $ 94  
Favorably impacted by an income tax benefit 90     90  
Income tax receivable recorded in other assets 90     90  
Tax Year 2014 [Member]          
Operating Loss Carryforwards [Line Items]          
Refund claim to carryback net operating loss from Settlement with Taxing Authority $ 90     $ 90