Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net income (loss)	$ (1)	$ 347	$ 40	$ 1,038
Other comprehensive income (loss), net of tax
Unrealized gains (losses) on investments	8	11	(16)	111
Cumulative translation adjustments	91	(216)	(9)	(180)
Pension and other postretirement benefit plans	147	108	430	355
Derivative instruments	38	(134)	(100)	(413)
Total other comprehensive income (loss)	284	(231)	305	(127)
Comprehensive income	283	116	345	911
Comprehensive income attributable to noncontrolling interests, net of tax	24	7	51	79
Comprehensive income attributable to The Dow Chemical Company	259	109	294	832
The Dow Chemical Company [Domain]
Net income (loss)	(1)	324	40	1,142
Other comprehensive income (loss), net of tax
Unrealized gains (losses) on investments	8	11	(16)	111
Cumulative translation adjustments	91	(216)	(9)	(180)
Pension and other postretirement benefit plans	147	108	430	355
Derivative instruments	38	(134)	(100)	(413)
Total other comprehensive income (loss)	284	(231)	305	(127)
Comprehensive income	283	93	345	1,015
Comprehensive income attributable to noncontrolling interests, net of tax	24	7	51	79
Comprehensive income attributable to The Dow Chemical Company	$ 259	$ 86	$ 294	$ 936