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