Commitments and Contingencies (Guarantees - Demerger and Divesture Obligations Narrative) (Details) In Millions, unless otherwise specified	149 Months Ended		3 Months Ended
	Mar. 31, 2012 Indemnification Agreements Hoechst [Member] USD ($)	Mar. 31, 2012 Indemnification Agreements Hoechst [Member] EUR (€)	Mar. 31, 2012 Divestiture Agreements [Member] USD ($)
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, estimate of possible loss			197
Loss contingency accrual, carrying value, payments	$ 57
Indemnification percentage, other		33.33%
Divestiture obligations range, years			one year to thirty years