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Shareholders' Equity - Roll-forward of changes in issued and outstanding common shares (Details) - $ / shares		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Common Shares:
Shares issued, beginning of year		579,000,841	574,617,195	570,737,283
Shares issued	[1]	2,669,229	2,646,164	2,835,994
Restricted shares issued, net of cancellations		1,619,780	1,737,482	1,043,918
Shares issued, end of year		583,289,850	579,000,841	574,617,195
Common shares held in treasury, end of year		(204,365,956)	(172,280,199)	(168,997,994)
Common shares outstanding, end of year		378,923,894	406,720,642	405,619,201
Authorized and Issued:
Common shares authorized		1,800,000,000
Common shares, par value per share		$ 0.0011	$ 0.0011
Preferred shares authorized		50,000,000
Preferred shares, par value per share		$ 0.01
[1] Includes shares issued from the exercise of stock options and stock appreciation rights, the vesting of restricted share units and shares issued from the employee share purchase plan.

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