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Long-Term Employee Benefits (Defined Benefit Plans) (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Jul. 01, 2015 | Jan. 01, 2013
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Transfer of plan assets and obligations to Chemours, impact |  |  |  |  |  |  | $ 21 |
United States Pension Plan of US Entity [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Net periodic benefits costs, expected return on plan assets assumption |  |  |  |  | 8.50% | 8.75% |  |
Pension Plans [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Curtailment gain | $ 7 | $ 0 | $ 7 | $ (4) |  |  |  |
Defined benefit plan, discount rate |  |  |  |  |  | 4.10% | 4.50% |
Defined benefit plan, re-measurement impact, underfunded status |  |  |  |  |  |  | $ 634 |
Charge related to prior period settlements | 32 |  |  |  |  |  |  |
Charge related to prior period settlements, after-tax | 21 |  |  |  |  |  |  |
Accumulated other comprehensive loss revision for pension settlement charges |  |  |  |  |  |  |  | $ 54
Other Long-Term Employee Benefit Plans [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Curtailment gain | $ 274 | $ 0 | $ 274 | $ 0 |  |  |  |
Defined benefit plan, discount rate |  |  |  |  |  | 3.95% | 4.30% |
Defined benefit plan, re-measurement impact, benefit obligation |  |  |  |  |  |  | $ 73 |
Deferred Income Taxes [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Transfer of unrecognized losses to Chemours, impact |  |  |  |  |  |  | 88 |
Accumulated other comprehensive loss [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Transfer of unrecognized losses to Chemours, impact |  |  |  |  |  |  | $ 278 |

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- Definition Revised accumulated other comprehensive loss to adjust for pension settlement charges that should have been recorded in prior years. + References No definition available. + Details
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- Definition The impact to the underfunded status of the sponsored pension and other long-term employee benefit plans as a result of the transfer of assets and obligations to Chemours upon separation. + References No definition available. + Details
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- Definition The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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