Share-Based Payments (Stock option activity) (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Shares
Outstanding, Beginning Balance (in shares)		1,526,502
Granted (in shares)		276,086
Exercised (in shares)		(315,736)
Forfeited (in shares)		(38,903)
Outstanding, Ending Balance (in shares)		1,447,949	1,526,502
Weighted-average Exercise Price Per Share
Outstanding, Beginning Balance (in dollars per share)		$ 119.13
Granted (in dollars per share)		195.49
Exercised (in dollars per share)		64.82
Forfeited (in dollars per share)		182.58
Outstanding, Ending Balance (in dollars per share)		$ 143.83	$ 119.13
Outstanding, Weighted-average Remaining Contractual Term (in years)		6 years
Outstanding, Aggregate Intrinsic Value	[1]	$ 43,065,332
Exercisable, December 31, 2024		846,647
Exercisable, Weighted Average Exercise Price Per Share		$ 112.36
Exercisable, Weighted Average Remaining Contractual Term (in years)		4 years 4 months 24 days
Vested and expected to vest, Aggregate Intrinsic Value	[1]	$ 42,923,962
Weighted-average grant date fair value per stock option		$ 50.77	$ 43.56	$ 51.13
Aggregate intrinsic value on exercise		$ 40	$ 81	$ 31
Cash received upon exercise		20	42	15
Share-based Payment Arrangement, Exercise of Option, Tax Benefit		$ 17	$ 17	$ 19

[1] Market price of underlying Zoetis common stock less exercise price.