Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net Income	$ 805	$ 818	$ 3,079	$ 4,320
Other comprehensive income (loss), net of tax
Unrealized gains (losses) on investments	(51)	8	(43)	42
Cumulative translation adjustments	193	83	819	325
Pension and other postretirement benefit plans	105	93	308	640
Derivative instruments	32	(20)	(57)	(21)
Total other comprehensive income	279	164	1,027	986
Comprehensive Income	1,084	982	4,106	5,306
Comprehensive income attributable to noncontrolling interests, net of tax	28	35	121	103
Comprehensive Income Attributable to The Dow Chemical Company	$ 1,056	$ 947	$ 3,985	$ 5,203