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Earnings Per Share ("EPS") - Additional Information (Detail) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share [Abstract]        
Antidilutive Securities excluded from Computation of Earnings Per Share 3 6 3 6