Shareholders' Equity - Roll-forward of changes in issued and outstanding common shares (Details) - $ / shares		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Common Shares:
Shares issued, beginning of year		583,289,850	579,000,841	574,617,195
Shares issued	[1]	3,517,399	2,669,229	2,646,164
Restricted shares issued, net of cancellations		1,443,513	1,619,780	1,737,482
Shares issued, end of year		588,250,762	583,289,850	579,000,841
Common shares held in treasury, end of year		(217,904,765)	(204,365,956)	(172,280,199)
Common shares outstanding, end of year		370,345,997	378,923,894	406,720,642
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.