Commitments and Contingencies (Guarantees - Demerger and Divesture Obligations Narrative) (Details) € in Millions, $ in Millions	9 Months Ended	191 Months Ended
	Sep. 30, 2015 EUR (€)	Sep. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)
Indemnification Agreements Hoechst [Member]
Loss Contingencies [Line Items]
Number of divestiture agreements	19		19
Indemnification amount | €	€ 250
Indemnification ceiling amount | €	€ 750
Indemnification percentage exceeding ceiling amount	33.33%		33.33%
Loss contingency accrual, carrying value, payments		$ 71
Indemnification percentage, other	33.33%		33.33%
Divestiture Agreements [Member]
Loss Contingencies [Line Items]
Term of divestiture obligations	2037
Guarantor obligations, maximum exposure			$ 205