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Capital Stock - Schedule of Changes in Number of Common Shares Outstanding (Detail) - shares	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Class Of Stock [Line Items]
Beginning balance	249,630,803	249,510,022
Restricted stock grants	3,301,344	1,186,290
Treasury shares acquired	(7,999,194)	(1,798,468)
Ending balance	245,877,502	249,630,803
Restricted Stock
Class Of Stock [Line Items]
Restricted stock units vested	944,549	720,212
Performance Share
Class Of Stock [Line Items]
Performance stock units issued	0	12,747

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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