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Stockholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Equity [Abstract]      
Common stock, shares authorized 4,500,000,000    
Common stock, par value $ 0.01    
Common stock, shares outstanding 1,384,515,345 1,382,964,324  
Preferred stock, shares authorized 200,000,000    
Preferred stock, par value $ 0.01    
Preferred stock, issued 0    
Other comprehensive income (loss) $ 184 $ (239) $ 369