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Commitments and Contingent Liabilities - Litigation - Narrative (Details)		1 Months Ended					3 Months Ended	12 Months Ended		17 Months Ended
	May 23, 2017 USD ($)	Jan. 31, 2021 USD ($) plaintiff	Dec. 31, 2020 USD ($) lawsuit WaterSystem	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($) lawsuit	Mar. 31, 2017 USD ($) lawsuit	Dec. 31, 2020 USD ($) lawsuit	Dec. 31, 2020 USD ($) lawsuit water_district	Dec. 31, 2004 resident	Dec. 31, 2020 USD ($) lawsuit Supplier	Sep. 30, 2020 lawsuit	Dec. 31, 2019 USD ($) lawsuit
Loss Contingencies [Line Items]
Accrual balance			$ 88,000,000				$ 88,000,000	$ 88,000,000		$ 88,000,000		$ 60,000,000
Number of long island water suppliers filed lawsuits \| Supplier										11
Chemical Solutions [Member] \| Mining Solutions [Member]
Loss Contingencies [Line Items]
Long-lived assets			146,000,000				146,000,000	146,000,000		$ 146,000,000
Chemical Solutions [Member] \| Contract Termination Fees [Member] \| Mining Solutions [Member]
Loss Contingencies [Line Items]
Other charges							26,000,000
Chemical Solutions [Member] \| Other Related Prepaid Costs [Member] \| Mining Solutions [Member]
Loss Contingencies [Line Items]
Other charges							11,000,000
Maximum [Member]
Loss Contingencies [Line Items]
Loss contingency, potential additional loss			580,000,000				580,000,000	580,000,000		580,000,000
Funding for medical monitoring program [Member]
Loss Contingencies [Line Items]
Escrow deposit disbursements								$ 1,700,000
First MDL Settlement [Member]
Loss Contingencies [Line Items]
Date of agreement month and year								2017-03
Total settlement amount						$ 670,700,000
Settlement payments	$ 335,000,000
P F O A Second M D L Settlement
Loss Contingencies [Line Items]
Accrual balance			$ 29,000,000				$ 29,000,000	$ 29,000,000		$ 29,000,000
Asbestos Issue [Member]
Loss Contingencies [Line Items]
Lawsuits alleging personal injury - Filed \| lawsuit			1,100				1,100	1,100		1,100		1,100
Accrual balance			$ 34,000,000				$ 34,000,000	$ 34,000,000		$ 34,000,000		$ 34,000,000
Benzene Related Illness [Member]
Loss Contingencies [Line Items]
Lawsuits alleging illness \| lawsuit			17				17	17		17		16
PFOA Matters [Member]
Loss Contingencies [Line Items]
Accrual balance			$ 21,000,000				$ 21,000,000	$ 21,000,000		$ 21,000,000		$ 20,000,000
Number of lawsuits filed \| lawsuit											3
PFOA Matters [Member] \| Maximum [Member]
Loss Contingencies [Line Items]
Settlement payments								$ 25,000,000
Period of payments								5 years
PFOA Matters: Drinking Water Actions [Member]
Loss Contingencies [Line Items]
Accrual balance			21,000,000				21,000,000	$ 21,000,000		21,000,000		$ 20,000,000
Binding settlement agreement, class size \| resident									80,000
Number of water districts Company must provide treatment \| water_district								6
PFOA Matters: Drinking Water Actions [Member] \| Funding for medical monitoring program [Member]
Loss Contingencies [Line Items]
Loss contingency, potential additional loss			$ 235,000,000				$ 235,000,000	$ 235,000,000		$ 235,000,000
PFOA Matters: Additional Actions [Member]
Loss Contingencies [Line Items]
Lawsuits alleging personal injury - Filed \| lawsuit						3,500
DuPont [Member]
Loss Contingencies [Line Items]
Lawsuits alleging illness \| lawsuit			50				50	50		50
DuPont [Member] \| Maximum [Member]
Loss Contingencies [Line Items]
Settlement payments								$ 25,000,000
DuPont [Member] \| Business Seeking to Recover Losses [Member]
Loss Contingencies [Line Items]
Lawsuits alleging illness \| lawsuit			2				2	2		2
Compensatory and Emotional Distress Damages [Member] \| P F O A M D L Settlement
Loss Contingencies [Line Items]
Loss contingency damages awarded value				$ 40,000,000
Consortium Damages [Member] \| P F O A M D L Settlement
Loss Contingencies [Line Items]
Loss contingency damages awarded value				$ 10,000,000
Compensatory and Punitive Damages [Member]
Loss Contingencies [Line Items]
Number of lawsuits filed \| lawsuit			3				3	3		3
Injunctive Relief and Compensatory and Punitive Damages [Member]
Loss Contingencies [Line Items]
Number of southern California public water systems filed lawsuit \| WaterSystem			11
NJ DEP [Member]
Loss Contingencies [Line Items]
Number of lawsuits filed \| lawsuit					4
Cost of preparation of natural resource damage assessment plan and access to related documents					$ 100,000
Subsequent Event [Member] \| PFOA After First MDL Settlement [Member]
Loss Contingencies [Line Items]
Number of individual plaintiffs \| plaintiff		96
Subsequent Event [Member] \| P F O A Second M D L Settlement
Loss Contingencies [Line Items]
Loss contingency expected settlement amount		$ 83,000,000
Subsequent Event [Member] \| DuPont [Member] \| P F O A Second M D L Settlement
Loss Contingencies [Line Items]
Loss contingency expected settlement amount		27,000,000
Subsequent Event [Member] \| Chemours [Member] \| P F O A Second M D L Settlement
Loss Contingencies [Line Items]
Loss contingency expected settlement amount		29,000,000
Subsequent Event [Member] \| Corteva [Member] \| P F O A Second M D L Settlement
Loss Contingencies [Line Items]
Loss contingency expected settlement amount		27,000,000
Memorandum of Understanding [Member] \| Subsequent Event [Member]
Loss Contingencies [Line Items]
Aggregate amount of qualified spend		$ 4,000,000,000
Memorandum of Understanding [Member] \| Subsequent Event [Member] \| Chemours [Member] \| PFAS Liabilities [Member]
Loss Contingencies [Line Items]
Percentage of escrow deposits contribution to restore escrow balance to 700		50.00%
Memorandum of Understanding [Member] \| Subsequent Event [Member] \| DuPont and Corteva [Member] \| PFAS Liabilities [Member]
Loss Contingencies [Line Items]
Percentage of escrow deposits contribution to restore escrow balance to 700		50.00%
Memorandum of Understanding [Member] \| Subsequent Event [Member] \| No Later Than Each of September 30, 2021 and September 30, 2022 [Member] \| Chemours [Member] \| PFAS Liabilities [Member]
Loss Contingencies [Line Items]
Escrow deposit		$ 100,000,000
Memorandum of Understanding [Member] \| Subsequent Event [Member] \| No Later Than Each of September 30, 2021 and September 30, 2022 [Member] \| DuPont and Corteva [Member] \| PFAS Liabilities [Member]
Loss Contingencies [Line Items]
Escrow deposit		100,000,000
Memorandum of Understanding [Member] \| Subsequent Event [Member] \| No Later Than September 30 of Each Subsequent Year Through and Including 2028 [Member] \| Chemours [Member] \| PFAS Liabilities [Member]
Loss Contingencies [Line Items]
Escrow deposit		50,000,000
Memorandum of Understanding [Member] \| Subsequent Event [Member] \| No Later Than September 30 of Each Subsequent Year Through and Including 2028 [Member] \| DuPont and Corteva [Member] \| PFAS Liabilities [Member]
Loss Contingencies [Line Items]
Escrow deposit		50,000,000
Memorandum of Understanding [Member] \| Subsequent Event [Member] \| Minimum Balance on December 31, 2028 [Member] \| PFAS Liabilities [Member]
Loss Contingencies [Line Items]
Escrow deposit		700,000,000
Memorandum of Understanding [Member] \| Subsequent Event [Member] \| Before January 2026 [Member] \| PFAS Liabilities [Member]
Loss Contingencies [Line Items]
Minimum settlement amount required to allow withdrawals from escrow account		125,000,000
Memorandum of Understanding [Member] \| Subsequent Event [Member] \| Starting in January 2026 [Member] \| PFAS Liabilities [Member]
Loss Contingencies [Line Items]
Minimum amount of qualified spend required to allow withdrawals from escrow account		$ 200,000,000