Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Consolidated Statement of Comprehensive Income
Net income including noncontrolling interest	$ 5,388	$ 4,582	$ 5,363
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	447	211	(467)
Defined benefit pension and postretirement plans adjustment	171	(560)	444
Cash flow hedging instruments			176
Cash flow hedging instruments	(142)	(72)
Total other comprehensive income (loss), net of tax	476	(421)	153
Comprehensive income (loss) including noncontrolling interest	5,864	4,161	5,516
Comprehensive (income) loss attributable to noncontrolling interest	(2)	(11)	(8)
Comprehensive income (loss) attributable to 3M	$ 5,862	$ 4,150	$ 5,508