Commitments and Contingencies (Guarantees - Demerger and Divesture Obligations Narrative) (Details) In Millions, unless otherwise specified	185 Months Ended		3 Months Ended
	Mar. 31, 2015 Indemnification Agreements Hoechst [Member] USD ($)	Mar. 31, 2015 Indemnification Agreements Hoechst [Member] EUR (€)	Mar. 31, 2015 Divestiture Agreements [Member] USD ($)
Loss Contingencies [Line Items]
Number of divestiture agreements		19
Indemnification floor amount		€ 250
Indemnification ceiling amount		750
Indemnification percentage exceeding ceiling amount		33.33%
Loss contingency accrual, carrying value, payments	69
Indemnification percentage, other		33.33%
Term of divestiture obligations			2037
Guarantor obligations, maximum exposure			$ 207