Supplemental Equity and Comprehensive Income Information (Details 3) (USD $) In Millions	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Consolidated Statement of Comprehensive Income (Loss)
Net income including noncontrolling interest	$ 1,103	$ 1,125	$ 3,383	$ 3,220
Other comprehensive income, net of tax:
Cumulative translation adjustment	(490)	669	(14)	216
Defined benefit pension and postretirement plans adjustment	77	48	207	147
Debt and equity securities, unrealized gain (loss)	(2)	3	(5)	5
Cash flow hedging instruments, unrealized gain (loss)	54	(52)	37	11
Total other comprehensive income (loss), net of tax	(361)	668	225	379
Comprehensive income (loss) including noncontrolling interest	742	1,793	3,608	3,599
Comprehensive (income) loss attributable to noncontrolling interest	(32)	(37)	(75)	(93)
Comprehensive income (loss) attributable to 3M	$ 710	$ 1,756	$ 3,533	$ 3,506

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