STOCKHOLDERS' EQUITY (Employee Stock Ownership Plan) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended			0 Months Ended	1 Months Ended	12 Months Ended				3 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	May 11, 2009 Dow ESOP [Member]	May 31, 2009 Dow ESOP [Member]	Dec. 31, 2011 Dow ESOP [Member]	Dec. 31, 2010 Dow ESOP [Member]	Dec. 31, 2009 Dow ESOP [Member]	Apr. 02, 2009 Rohm And Haas [Member]	Jun. 30, 2009 Rohm And Haas [Member] Rohm and Haas ESOP [Member]	Apr. 02, 2009 Rohm And Haas [Member] Rohm and Haas ESOP [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Cash paid to Rohm and Haas Company ESOP											$ 552
Employee Stock Ownership Plan (ESOP), Shares in ESOP						43.6			7.0		7.0
Shares issued under option and purchase plans (in shares)	5.6	7.5	8.7
Debt of ESOP	57	64							78
Interest rate on debt of ESOP										9.80%
Treasury stock sold to ESOP, shares					36.7
Price per share, Sale of stock (in dollars per share)				$ 15.0561
Treasury stock sold to ESOP, value				553
Aggregate historical cost of treasury shares	0	239		1,529
ESOP, compensation expense						102	81	48
Shares allocated to participants' accounts						14.9
Number of released, but unallocated, shares						1.1
Number of unearned shares						27.6
Fair value of unearned shares						$ 793