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Schedule I - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Condensed Financial Statements Captions [Line Items]      
Income tax benefit $ (116) $ (59) $ 992
Parent Company [Member]      
Condensed Financial Statements Captions [Line Items]      
Minimum percentage of restricted net assets of consolidated subsidiaries of consolidated net assets 25.00%    
Income tax benefit $ 0 $ 1 $ 3