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Commitments and Contingent Liabilities (Environmental) (Narrative) (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Environmental Remediation [Line Items] |  |
Accrual for environmental remediation activities | $ 455 | $ 457
Potential environmental liability in excess of accrued amount | 910 |
Chemours [Member] |  |
Environmental Remediation [Line Items] |  |
Accrual for environmental remediation activities | 256 |
Potential environmental liability in excess of accrued amount | 436 |
Chemours [Member] | Indemnification Agreement [Member] |  |
Environmental Remediation [Line Items] |  |
Indemnification Asset | 256 |
Superfund Sites [Member] |  |
Environmental Remediation [Line Items] |  |
Accrual for environmental remediation activities | 74 | $ 17
Superfund Sites [Member] | Chemours [Member] | Indemnification Agreement [Member] |  |
Environmental Remediation [Line Items] |  |
Indemnification Asset | $ 54 |

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- Definition 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 + Details
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- Definition Carrying amount as of the balance sheet date of known and reasonably estimable amounts of recoveries from third-parties pertaining to an entity's environmental remediation obligations. An entity's balance sheet may include several assets that relate to an environmental remediation obligation. Among them are the following: a. Receivables from other potentially responsible parties that are not providing initial funding; b. anticipated recoveries from insurers; and c. anticipated recoveries from prior owners as a result of indemnification agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64822958&loc=d3e13022-110858 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 + Details
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