| Consolidated Statement of Comprehensive Income (Loss) | ||||||||||||
| Three months ended June 30 | Six months ended June 30 | |||||||||||
| (Millions) | 2009 | 2008 | 2009 | 2008 | ||||||||
| Net income including noncontrolling interest | $ | 792 | $ | 963 | $ | 1,322 | $ | 1,969 | ||||
| Other comprehensive income, net of tax: | ||||||||||||
| Cumulative translation adjustment | 460 | (141 | ) | 8 | 246 | |||||||
| Defined benefit pension and postretirement plans adjustment | 21 | 15 | — | 46 | ||||||||
| Debt and equity securities, unrealized gain (loss) | 4 | (7 | ) | 5 | (3 | |||||||
| Cash flow hedging instruments, unrealized gain (loss) | (72 | ) | 29 | (77 | ) | 25 | ||||||
| Total other comprehensive income (loss), net of tax | 413 | (104 | ) | (64 | ) | 314 | ||||||
| Comprehensive income (loss) including noncontrolling interest | 1,205 | 859 | 1,258 | 2,283 | ||||||||
| Comprehensive (income) loss attributable to noncontrolling interest | (14 | ) | (10 | ) | 6 | (54 | ||||||
| Comprehensive income (loss) attributable to 3M | $ | 1,191 | $ | 849 | 1,264 | $ | 2,229 | |||||
| Accumulated Other Comprehensive Income (Loss) Attributable to 3M | ||||||||||||
| June 30, | Dec. 31, | |||||||||||
| (Millions) | 2009 | 2008 | ||||||||||
| Cumulative translation adjustment | $ | (111 | ) | $ | (146 | ) | ||||||
| Defined benefit pension and postretirement plans adjustment | (3,525 | ) | (3,525 | ) | ||||||||
| Debt and equity securities, unrealized gain (loss) | (14 | ) | (19 | ) | ||||||||
| Cash flow hedging instruments, unrealized gain (loss) | (33 | ) | 44 | |||||||||
| Total accumulated other comprehensive income (loss) | $ | (3,683 | ) | $ | (3,646 | ) | ||||||
| Components of Comprehensive Income (Loss) Attributable to 3M | ||||||||||||
| Three months ended June 30, | Six months ended June 30, | |||||||||||
| (Millions) | 2009 | 2008 | 2009 | 2008 | ||||||||
| Net income attributable to 3M | $ | 783 | $ | 945 | $ | 1,301 | $ | 1,933 | ||||
| Cumulative translation | 437 | (72 | ) | 74 | 210 | |||||||
| Tax effect | 18 | (60 | ) | (39 | ) | 19 | ||||||
| Cumulative translation - net of tax | 455 | (132 | ) | 35 | 229 | |||||||
| Defined benefit pension and postretirement plans adjustment | 35 | 19 | (5 | ) | 68 | |||||||
| Tax effect | (14 | ) | (5 | ) | 5 | (23 | ||||||
| Defined benefit pension and postretirement plans adjustment - net of tax | 21 | 14 | — | 45 | ||||||||
| Debt and equity securities, unrealized gain (loss) | 6 | (11 | ) | 8 | (4 | |||||||
| Tax effect | (2 | ) | 4 | (3 | ) | 1 | ||||||
| Debt and equity securities, unrealized gain (loss) - net of tax | 4 | (7 | ) | 5 | (3 | |||||||
| Cash flow hedging instruments, unrealized gain (loss) | (114 | ) | 51 | (125 | ) | 45 | ||||||
| Tax effect | 42 | (22 | ) | 48 | (20 | |||||||
| Cash flow hedging instruments, unrealized gain (loss) - net of tax | (72 | ) | 29 | (77 | ) | 25 | ||||||
| Total comprehensive income (loss) attributable to 3M | $ | 1,191 | $ | 849 | $ | 1,264 | $ | 2,229 | ||||