Commitments and Contingencies (Guarantees - Demerger and Divesture Obligations Narrative) (Details) In Millions, unless otherwise specified			9 Months Ended		9 Months Ended
	Sep. 30, 2011 USD ($)	Dec. 31, 2010 USD ($)	Sep. 30, 2011 Indemnification Agreements Hoechst [Member] USD ($)	Sep. 30, 2011 Indemnification Agreements Hoechst [Member] EUR (€)	Sep. 30, 2011 Divestiture Agreements [Member] USD ($)
Loss Contingencies [Line Items]
Number of divestiture agreements				19
Indemnification floor amount				€ 250
Indemnification percentage exceeding ceiling amount				33.33%
Indemnification ceiling amount				750
Loss Contingency, Estimate of Possible Loss					196
Loss Contingency Accrual, Carrying Value, Payments			56
Demerger obligations	36	36
Indemnification percentage, other				33.33%
Divestiture obligations	$ 24	$ 26
Divestiture obligations range, years					one year to thirty years