Supplemental Equity and Comprehensive Income Information (Details 2) (USD $) In Millions	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Consolidated Statement of Comprehensive Income (Loss)
Net income including noncontrolling interest	$ 1,177	$ 1,140	$ 2,280	$ 2,095
Other comprehensive income, net of tax:
Cumulative translation adjustment	234	(358)	476	(453)
Defined benefit pension and postretirement plans adjustment	54	48	130	99
Debt and equity securities, unrealized gain (loss)	(2)	1	(3)	2
Cash flow hedging instruments, unrealized gain (loss)		40	(17)	63
Total other comprehensive income (loss), net of tax	286	(269)	586	(289)
Comprehensive income (loss) including noncontrolling interest	1,463	871	2,866	1,806
Comprehensive (income) loss attributable to noncontrolling interest	(27)	(31)	(43)	(56)
Comprehensive income (loss) attributable to 3M	$ 1,436	$ 840	$ 2,823	$ 1,750

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