Commitments and Contingencies - Environmental (Details)	1 Months Ended				3 Months Ended			12 Months Ended
	Mar. 31, 2020 USD ($)	Apr. 30, 2019 USD ($)	Jul. 31, 2018 USD ($)	Feb. 28, 2018 USD ($)	Dec. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2020 USD ($) lawsuit	Dec. 31, 2020 USD ($) individual lawsuit	Dec. 31, 2020 USD ($) lawsuit	Dec. 31, 2020 USD ($) item lawsuit	Dec. 31, 2020 USD ($) lawsuit	Dec. 31, 2020 USD ($) lawsuit facility	Dec. 31, 2020 USD ($) lawsuit defendant	Dec. 31, 2020 USD ($) subsidiary lawsuit	Dec. 31, 2020 USD ($) lawsuit person	Dec. 31, 2020 USD ($) lawsuit company	Dec. 31, 2019 USD ($)
Environmental Matters - Remediation
Loss contingencies
Accrued loss contingency reserve | $								$ 23,000,000	$ 23,000,000	$ 23,000,000	$ 23,000,000	$ 23,000,000	$ 23,000,000	$ 23,000,000	$ 23,000,000	$ 23,000,000	$ 23,000,000
Environmental Matters - Remediation | Maximum
Loss contingencies
Number of years remediation payments expected to be paid for applicable sites								20 years
Environmental Matters - Other
Loss contingencies
Accrued loss contingency reserve | $								$ 0	0	0	0	0	0	0	0	0	0
Insurance receivables | $								$ 8,000,000	$ 8,000,000	$ 8,000,000	$ 8,000,000	$ 8,000,000	$ 8,000,000	$ 8,000,000	$ 8,000,000	$ 8,000,000	$ 8,000,000
Environmental Matters - Regulatory Activities
Loss contingencies
Number of years after phase-out decision in May 2000 that the Company stopped manufacturing and using vast majority of perfluorooctanyl compounds								2 years
Amount of PFOA and PFOS found in drinking water, either individually or combined, that are allowed per the EPA's announced lifetime health advisory levels in parts per trillion | item											70
Amount of PFOA in drinking water allowed per provisional health advisories in parts per trillion (superseded) | item											400
Amount of PFOS in drinking water allowed per provisional health advisories in parts per trillion (superseded) | item											200
Number of PFCs the EPA has required to have public water system suppliers monitor | item											6
Number compounds EPA asked for public comment on draft toxicity assessments for PFAS compounds, including PFBS | item											2
Number of guidance documents released by the EPA related to PFAS | item											2
Number of public water supplies the EPA reported results | item											4,920
Number of water supplies that reported above advisory level with PFOA | item											13
Number of water supplies that reported above advisory level with PFOS | item											46
Number of water supplies that reported above advisory level with both PFOA and PFOS under technical advisory issued by EPA in September 2016 | item											65
Environmental Matters - Regulatory Activities | Minimum
Loss contingencies
Number of water supply samples used to test for PFOA and PFOS under the EPA lifetime health advisory program | item											1
Environmental Matters - Regulatory Activities | U.S. District Court for the Northern District of Alabama
Loss contingencies
Number of plaintiffs dismissed | individual									5
Environmental Matters - Regulatory Activities | Massachusetts
Loss contingencies
Number of combined PFAS compounds detailed in published final regulations establishing a drinking water standard | item											6
Environmental Matters - Regulatory Activities | Minnesota Department of Health
Loss contingencies
Amount of PFOA in drinking water allowed per Minnesota Department of Health in parts per trillion | item											35
Amount of PFOS in drinking water allowed per Minnesota Department of Health in parts per trillion | item											27
Additional amounts of PFOS in drinking water allowed per Minnesota Department of Health in parts per trillion | item											15
Amount of PFHxS in drinking water allowed per Minnesota Department of Health in parts per trillion | item											47
Amount of PFBS in drinking water allowed per Minnesota Department of Health in parts per billion | item											2
Environmental Matters - Regulatory Activities | Vermont
Loss contingencies
Number of other perfluorinated compounds in drinking water standards | item											3
Environmental Matters - Litigation | U.S. District Court for the Northern District of Alabama
Loss contingencies
Number of plaintiffs | individual									55
Number of additional plaintiffs | individual									37
Environmental Matters - Litigation | Alabama
Loss contingencies
Litigation settlement awarded | $		$ 35,000,000
Number of local water works for whom the water authority supplies water | item											5
Environmental Matters - Litigation | Alabama | Minimum
Loss contingencies
Number of plaintiffs | individual									200
Environmental Matters - Litigation | Decatur, Alabama
Loss contingencies
Number of closed municipal landfills | item											3
Number of putative class action and other lawsuits												2
Environmental Matters - Litigation | Minnesota
Loss contingencies
Litigation settlement awarded | $							$ 897,000,000
Number of recommended options for utilizing the Water Quality and Sustainability Fund seeking public comment | item											3
Settlement amount paid | $				$ 850,000,000
Environmental Matters - Litigation | Lake Elmo, Minnesota | Maximum
Loss contingencies
Settlement amount paid | $		$ 5,000,000
Environmental Matters - Litigation | New Jersey
Loss contingencies
Number of lawsuits filed												2
Number of additional new claims filed												2
Number of additional defendants | defendant														6
Environmental Matters - Litigation | Salem County, New Jersey
Loss contingencies
Number of facilities related to the manufacture and disposal of PFAS | facility													2
Environmental Matters - Litigation | Michigan
Loss contingencies
Number of lawsuits filed												2
Environmental Matters - Litigation | Federal court of Michigan
Loss contingencies
Number of lawsuits filed												1
Environmental Matters - Litigation | State court in New York
Loss contingencies
Number of lawsuits filed												4
Environmental Matters - Litigation | State Court of Lawrence County, Alabama
Loss contingencies
Number of additional plaintiffs | individual									557
Number of amended additional plaintiffs | individual									331
Environmental Matters - Litigation | New Hampshire
Loss contingencies
Number of lawsuits filed												2
Number of additional defendants | defendant														7
Environmental Matters - Litigation | Vermont
Loss contingencies
Number of lawsuits filed												2
Number of additional defendants | defendant														10
Environmental Matters - Aqueous Film Forming Foam Litigation
Loss contingencies
Number of lawsuits filed												943
Number of lawsuits served												2
Number of putative class action and other lawsuits												26
Number of cases filed by current or former firefighters												414
Environmental Matters - Aqueous Film Forming Foam Litigation | U.S. Judicial Panel on Multidistrict Litigation (MDL)
Loss contingencies
Number of lawsuits filed												933
Number of putative class action and other lawsuits												947
Environmental Matters - Aqueous Film Forming Foam Litigation | Various state courts
Loss contingencies
Number of lawsuits filed												8
Number of lawsuits pending								5	5	5	5	5	5	5	5	5	5
Number of cases stayed												5
Environmental Matters - Aqueous Film Forming Foam Litigation | State court in Wisconsin
Loss contingencies
Number of subsidiaries of plaintiff | subsidiary															2
Environmental Matters - Aqueous Film Forming Foam Litigation | Federal court
Loss contingencies
Number of lawsuits pending								2	2	2	2	2	2	2	2	2	2
Environmental Matters - Other PFAS-related Environmental Litigation | U.S. District Court of New York State
Loss contingencies
Number of lawsuits filed												41
Number of additional new claims filed												4
Number of putative class action and other lawsuits												1
Number of cases the Company has filed answers in which it has been served												8
Environmental Matters - Other PFAS-related Environmental Litigation | U.S. District Court of Eastern District of New York
Loss contingencies
Number of lawsuits pending								11	11	11	11	11	11	11	11	11	11
Environmental Matters - Other PFAS-related Environmental Litigation | State court of California
Loss contingencies
Number of local water providers | facility													10
Environmental Matters - Other PFAS-related Environmental Litigation | Decatur, Alabama
Loss contingencies
Number of perfluorinated materials (FBSA and FBSEE) the company cannot release into "the waters of the United States." | item											2
Environmental Matters - Other PFAS-related Environmental Litigation | Georgia
Loss contingencies
Number of putative class action and other lawsuits												1
Environmental Matters - Other PFAS-related Environmental Litigation | Alabama and Georgia
Loss contingencies
Number of putative class action and other lawsuits												4
Environmental Matters - Other PFAS-related Environmental Litigation | Cities located downstream along the Coosa River
Loss contingencies
Number of putative class action and other lawsuits												3
Environmental Matters - Other PFAS-related Environmental Litigation | New Jersey
Loss contingencies
Number of lawsuits filed												2
Environmental Matters - Other PFAS-related Environmental Litigation | Near DuPont and Solvay Facilities
Loss contingencies
Number of lawsuits filed												3
Environmental Matters - Other PFAS-related Environmental Litigation | Michigan
Loss contingencies
Number of plaintiffs												274				1
Settlement amount paid | $	$ 55,000,000																	$ 70,000,000
Number of claims with summary judgment | defendant														1
Number of federal bellwether cases with trial-ready dates set												3
Number of federal bellwether cases the court issued the first round of dispositive motion rulings												2
Total number of federal bellwether cases												5
Number of putative class action and other lawsuits												1
Number of companies involved in agreement | company																	2
Environmental Matters - Other PFAS-related Environmental Litigation | Parchment, Michigan
Loss contingencies
Funds to provide expanded municipal water service | $										$ 5,000,000
Environmental Matters - Other PFAS-related Environmental Litigation | Delaware.
Loss contingencies
Number of putative class action and other lawsuits												1
Environmental Matters - Other Environmental Litigation
Loss contingencies
Accrued loss contingency reserve | $								$ 416,000,000	$ 416,000,000	416,000,000	$ 416,000,000	$ 416,000,000	$ 416,000,000	$ 416,000,000	$ 416,000,000	$ 416,000,000	$ 416,000,000
Increase (decrease) accrued loss contingency reserve | $										96,000,000
Litigation payments | $										$ 125,000,000
Charge for environmental resolutions | $					$ 214,000,000
Environmental Matters - Other Environmental Litigation | Alabama
Loss contingencies
Increase (decrease) accrued loss contingency reserve | $						$ 235,000,000
Environmental Matters - Other Environmental Litigation | New Jersey
Loss contingencies
Approximate number of miles of a river seeking to be cleaned | item											8
The value the award the plaintiff seeks | $			$ 165,000,000
Number of chemicals of concern in the sediment | item											8
Number of commercial drum conditioning facilities | item											2
Number of landfills tested by the entity for environmental matters and litigation related to historical PFAS manufacturing operations | item											4
Environmental Matters - Other Environmental Litigation | New Jersey | Minimum
Loss contingencies
Number of unnamed defendant | defendant														120