Consolidated Statement of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net income including noncontrolling interest	$ 1,225	$ 1,147
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	20	(398)
Defined benefit pension and postretirement plans adjustment	61	85
Debt and equity securities - unrealized gain (loss)	1	0
Cash flow hedging instruments - unrealized gain (loss)	2	24
Total other comprehensive income (loss), net of tax	84	(289)
Comprehensive income (loss) including noncontrolling interest	1,309	858
Comprehensive (income) loss attributable to noncontrolling interest	(30)	20
Comprehensive income (loss) attributable to 3M	$ 1,279	$ 878