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Earnings (Loss) Per Share - Additional Information (Detail) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Weighted average of mandatory convertible preferred shares 66 59 68 59