Organization and Basis of Presentation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Billions	6 Months Ended
	Dec. 31, 2020	Mar. 29, 2020	Dec. 31, 2019	Jul. 29, 2019
Common stock, par value		$ 0.01	$ 0.01
Pfizer Stockholders [Member]
Ownership percent				57.00%
Pfizer Stockholders [Member] | Scenario Forecast [Member]
Debt in connection with its separation from parent company	$ 12
Business combination, partial consideration transferred	$ 12
Mylan Shareholders [Member]
Ownership percent				43.00%