Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Consolidated Statement of Comprehensive Income
Net income including noncontrolling interest	$ 606	$ 1,326
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	167	292
Defined benefit pension and postretirement plans adjustment	116	83
Cash flow hedging instruments unrealized gain (loss)	(61)	(76)
Total other comprehensive income (loss), net of tax	222	299
Comprehensive income (loss) including noncontrolling interest	828	1,625
Comprehensive (income) loss attributable to noncontrolling interest	(3)	(6)
Comprehensive income (loss) attributable to 3M	$ 825	$ 1,619