Commitments and Contingencies (Guarantees - Demerger and Divesture Obligations Narrative) (Details) In Millions, unless otherwise specified			6 Months Ended			6 Months Ended
	Jun. 30, 2011 USD ($)	Dec. 31, 2010 USD ($)	Jun. 30, 2011 Indemnification Agreements Hoechst [Member] USD ($)	Jun. 30, 2011 Indemnification Agreements Hoechst [Member] EUR (€)	Dec. 31, 2010 Indemnification Agreements Hoechst [Member] USD ($)	Jun. 30, 2011 Divestiture Agreements [Member] USD ($)	Dec. 31, 2010 Divestiture Agreements [Member] USD ($)
Loss Contingencies [Line Items]
Number of divestiture agreements			19
Indemnification floor amount				€ 250
Indemnification percentage exceeding ceiling amount			0.33%
Indemnification ceiling amount				750
Loss Contingency, Estimate of Possible Loss				750		199
Number of divestiture agreements without monetary limits			3
Loss Contingency Accrual, Carrying Value, Payments			55
Demerger obligations	37	36	37		36
Indemnification percentage, other			0.33%
Divestiture obligations	$ 25	$ 26				$ 25	$ 26
Divestiture obligations range, years						one year to thirty years