Capital Stock - Schedule of Changes in Number of Common Shares Outstanding (Detail) - shares	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Class Of Stock [Line Items]
Beginning balance	246,348,092	249,630,803
Restricted stock grants	1,293,892	3,390,358
Treasury shares	3,149	(8,197,662)
Ending balance	249,792,908	246,348,092
Restricted Stock
Class Of Stock [Line Items]
Restricted stock units vested	1,493,341	1,226,473
Performance Share
Class Of Stock [Line Items]
Performance stock units issued	640,468	279,420
Performance stock dividends	13,966	18,700

Treasury stock shares acquired and issued.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

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Number of new stock issued during the period.

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