Acquisitions - Schedule of assets acquired and liabilities assumed (Details) - USD ($) $ in Millions	Sep. 30, 2021	Feb. 01, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill	$ 16,590		$ 5,593
Nutrition & Biosciences, Inc
Business Acquisition [Line Items]
Cash and cash equivalents	193	$ 207
Receivables	953	962
Inventory	1,586	1,615
Prepaid expenses and other current assets	343	342
Property, plant and equipment	3,064	3,242
Deferred income taxes	77	75
Intangible assets	9,298	9,176
Other non-current assets	746	702
Accounts payable and accrued liabilities	(1,047)	(1,028)
Accrued payroll and employee benefits	(162)	(163)
Deferred tax liabilities	(2,340)	(2,369)
Debt assumed	(7,636)	(7,636)
Other liabilities	(889)	(907)
Total identifiable net assets assumed	4,186	4,218
Noncontrolling interest	(34)	(26)
Goodwill	11,802	11,762
Preliminary purchase price	15,954	$ 15,954
Nutrition & Biosciences, Inc | Measurement period adjustments
Business Acquisition [Line Items]
Cash and cash equivalents	(14)
Receivables	(9)
Inventory	(29)
Prepaid expenses and other current assets	1
Property, plant and equipment	(178)
Deferred income taxes	2
Intangible assets	122
Other non-current assets	44
Accounts payable and accrued liabilities	(19)
Accrued payroll and employee benefits	1
Deferred tax liabilities	29
Debt assumed	0
Other liabilities	18
Total identifiable net assets assumed	(32)
Noncontrolling interest	(8)
Goodwill	40
Preliminary purchase price	$ 0