Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Consolidated Statement of Comprehensive Income
Net income including noncontrolling interest	$ 1,862	$ 1,585	$ 2,468	$ 2,911
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	(496)	(67)	(329)	225
Defined benefit pension and postretirement plans adjustment	114	78	230	161
Cash flow hedging instruments unrealized gain (loss)	162	(51)	101	(127)
Total other comprehensive income (loss), net of tax	(220)	(40)	2	259
Comprehensive income (loss) including noncontrolling interest	1,642	1,545	2,470	3,170
Comprehensive (income) loss attributable to noncontrolling interest	(1)	(2)	(4)	(8)
Comprehensive income (loss) attributable to 3M	$ 1,641	$ 1,543	$ 2,466	$ 3,162