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Capital Stock - Schedule of Changes in Number of Common Shares Outstanding (Detail) - shares
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Class Of Stock [Line Items]    
Beginning balance 249,630,803 249,510,022
Restricted stock grants 3,390,358 1,186,290
Treasury shares acquired (8,197,662) (1,798,468)
Ending balance 246,226,215 249,630,803
Restricted Stock    
Class Of Stock [Line Items]    
Restricted stock units vested 1,104,596 720,212
Performance Share    
Class Of Stock [Line Items]    
Performance stock units issued 279,420 12,747
Performance stock dividends 18,700,000 0