Shareholders' Equity - Roll-forward of changes in issued and outstanding common shares (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Billions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Authorized and Issued:
Common shares authorized		1,800.0
Common shares, par value per share		$ 0.0011	$ 0.0011
Preferred shares authorized		50.0
Preferred shares, par value per share		$ 0.01
Common Shares:
Shares issued, beginning of year		591.9	588.3	583.3
Shares issued	[1]	2.5	2.8	3.5
Restricted shares issued, net of cancellations		1.2	0.8	1.5
Shares issued, end of year		595.6	591.9	588.3
Common shares held in treasury, end of year		(219.2)	(218.5)	(217.9)
Common shares outstanding, end of year		376.4	373.4	370.4
Special Cash Dividend
Special cash dividend declared		$ 1.9
Special cash dividend declared per share (in dollars per share)		$ 5.00

[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.