Asset Impairment, Restructuring and Other Special Charges - Additional Information (Details) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) position country restructuringProgram	Dec. 31, 2020 USD ($)
Restructuring Cost and Reserve [Line Items]
Number of restructuring programs announced | restructuringProgram		2
Restructuring reserve, accrual adjustment		$ 16	$ 4
Restructuring, expected payment term		15 months
January 2021 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Expected number of positions eliminated | position		315
Restructuring costs		$ 43
November 2021 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Expected number of positions eliminated | position		380
Restructuring costs	$ 86
Bayer Animal Business
Restructuring Cost and Reserve [Line Items]
Expected number of positions eliminated | position		900
Restructuring reserve, accrual adjustment		$ 15	$ 162
Number of countries expected to eliminate positions | country		40