Commitments and Contingent Liabilities Commitments and Contingent Liabilities (Environmental) (Narrative) (Details) $ in Millions	6 Months Ended
Jun. 30, 2017 USD ($) yr
Environmental Remediation [Line Items]
Accrual for environmental remediation activities	$ 490
Potential environmental liability in excess of accrued amount	$ 790
Minimum [Member]
Environmental Remediation [Line Items]
Average time frame of disbursements of environmental site remediation \| yr	15
Maximum [Member]
Environmental Remediation [Line Items]
Average time frame of disbursements of environmental site remediation \| yr	20
Chemours [Member]
Environmental Remediation [Line Items]
Accrual for environmental remediation activities	$ 261
Potential environmental liability in excess of accrued amount	410
Indemnification assets	$ 261

Average time frame of disbursements of environmental site remediation

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Indemnification asset for liabilities indemnified by Chemours against certain litigation, environmental, workers' compensation and other liabilities that arose prior to the spin-off of Chemours.

+ References

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Potential environmental liability in excess of accrued amount

+ References

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 25
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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