Consolidated Statement of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net income including noncontrolling interest	$ 1,186	$ 1,177	$ 2,327	$ 2,280
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	(335)	234	(201)	476
Defined benefit pension and postretirement plans adjustment	98	54	195	130
Debt and equity securities, unrealized gain (loss)	(2)	(2)	1	(3)
Cash flow hedging instruments, unrealized gain (loss)	23	0	8	(17)
Total other comprehensive income (loss), net of tax	(216)	286	3	586
Comprehensive income (loss) including noncontrolling interest	970	1,463	2,330	2,866
Comprehensive (income) loss attributable to noncontrolling interest	(30)	(27)	(25)	(43)
Comprehensive income (loss) attributable to 3M	$ 940	$ 1,436	$ 2,305	$ 2,823

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