Consolidated Statement of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net income including noncontrolling interest	$ 1,311	$ 1,245	$ 3,819	$ 3,605
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	(603)	284	(456)	(393)
Defined benefit pension and postretirement plans adjustment	59	92	180	268
Debt and equity securities - unrealized gain (loss)	(1)	2	1	(2)
Cash flow hedging instruments - unrealized gain (loss)	68	(24)	61	8
Total other comprehensive income (loss), net of tax	(477)	354	(214)	(119)
Comprehensive income (loss) including noncontrolling interest	834	1,599	3,605	3,486
Comprehensive (income) loss attributable to noncontrolling interest	2	(13)	(48)	10
Comprehensive income (loss) attributable to 3M	$ 836	$ 1,586	$ 3,557	$ 3,496