Consolidated Statement of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net income including noncontrolling interest	$ 1,245	$ 1,180	$ 3,605	$ 3,507
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	284	412	(393)	211
Defined benefit pension and postretirement plans adjustment	92	96	268	291
Debt and equity securities - unrealized gain (loss)	2	3	(2)	4
Cash flow hedging instruments - unrealized gain (loss)	(24)	(36)	8	(28)
Total other comprehensive income (loss), net of tax	354	475	(119)	478
Comprehensive income (loss) including noncontrolling interest	1,599	1,655	3,486	3,985
Comprehensive (income) loss attributable to noncontrolling interest	(13)	(30)	10	(55)
Comprehensive income (loss) attributable to 3M	$ 1,586	$ 1,625	$ 3,496	$ 3,930