Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Consolidated Statement of Comprehensive Income
Net income including noncontrolling interest	$ 1,298	$ 1,311	$ 3,802	$ 3,819
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	(472)	(603)	(642)	(456)
Defined benefit pension and postretirement plans adjustment	236	59	423	180
Debt and equity securities - unrealized gain (loss)		(1)		1
Cash flow hedging instruments - unrealized gain (loss)	1	68	39	61
Total other comprehensive income (loss), net of tax	(235)	(477)	(180)	(214)
Comprehensive income (loss) including noncontrolling interest	1,063	834	3,622	3,605
Comprehensive (income) loss attributable to noncontrolling interest	(1)	2	(5)	(48)
Comprehensive income (loss) attributable to 3M	$ 1,062	$ 836	$ 3,617	$ 3,557