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Cash Dividends - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
May 29, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Dividends [Abstract]                  
Dividends payable, amount per share $ 0.05                
Dividends payable, declared date May 29, 2019                
Dividends payable, paid date Sep. 27, 2019                
Dividends payable, record date Sep. 13, 2019                
Cash dividends paid   $ 20 $ 19 $ 19 $ 19 $ 19 $ 19 $ 58 $ 57