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Supplemental Equity and Comprehensive Income Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Supplemental Equity and Comprehensive Income Information |
Changes in Accumulated Other Comprehensive Income (Loss) Attributable to 3M | Changes in Accumulated Other Comprehensive Income (Loss) Attributable to 3M by Component
|  |  |  |  | Defined Benefit |  | Cash Flow |  | Total |
|  |  |  |  | Pension and |  | Hedging |  | Accumulated |
|  | Cumulative |  | Postretirement |  | Instruments, |  | Other |
|  | Translation |  | Plans |  | Unrealized |  | Comprehensive |
(Millions) |  | Adjustment |  | Adjustment |  | Gain (Loss) |  | Income (Loss) |
Balance at December 31, 2014, net of tax: |  | $ | (1,095) |  | $ | (5,293) |  | $ | 99 |  | $ | (6,289) |
Other comprehensive income (loss), before tax: |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts before reclassifications |  |  | (447) |  |  | 367 |  |  | 212 |  |  | 132 |
Amounts reclassified out |  |  | — |  |  | 537 |  |  | (174) |  |  | 363 |
Total other comprehensive income (loss), before tax |  |  | (447) |  |  | 904 |  |  | 38 |  |  | 495 |
Tax effect |  |  | (137) |  |  | (415) |  |  | (13) |  |  | (565) |
Total other comprehensive income (loss), net of tax |  |  | (584) |  |  | 489 |  |  | 25 |  |  | (70) |
Balance at December 31, 2015, net of tax: |  | $ | (1,679) |  | $ | (4,804) |  | $ | 124 |  | $ | (6,359) |
Other comprehensive income (loss), before tax: |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts before reclassifications |  |  | (244) |  |  | (1,122) |  |  | 57 |  |  | (1,309) |
Amounts reclassified out |  |  | — |  |  | 421 |  |  | (109) |  |  | 312 |
Total other comprehensive income (loss), before tax |  |  | (244) |  |  | (701) |  |  | (52) |  |  | (997) |
Tax effect |  |  | (85) |  |  | 177 |  |  | 19 |  |  | 111 |
Total other comprehensive income (loss), net of tax |  |  | (329) |  |  | (524) |  |  | (33) |  |  | (886) |
Balance at December 31, 2016, net of tax: |  | $ | (2,008) |  | $ | (5,328) |  | $ | 91 |  | $ | (7,245) |
Other comprehensive income (loss), before tax: |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts before reclassifications |  |  | 91 |  |  | (600) |  |  | (311) |  |  | (820) |
Amounts reclassified out |  |  | — |  |  | 483 |  |  | (7) |  |  | 476 |
Total other comprehensive income (loss), before tax |  |  | 91 |  |  | (117) |  |  | (318) |  |  | (344) |
Tax effect |  |  | 279 |  |  | 169 |  |  | 115 |  |  | 563 |
Total other comprehensive income (loss), net of tax |  |  | 370 |  |  | 52 |  |  | (203) |  |  | 219 |
Balance at December 31, 2017, net of tax: |  | $ | (1,638) |  | $ | (5,276) |  | $ | (112) |  | $ | (7,026) |
Reclassifications Out of Accumulated Other Comprehensive Income | Reclassifications out of Accumulated Other Comprehensive Income Attributable to 3M
|  |  | Amounts Reclassified from |  |  |
Details about Accumulated Other |  |  | Accumulated Other Comprehensive Income |  |  |
Comprehensive Income Components |  |  | Year ended December 31, |  | Location on Income |
(Millions) |  |  | 2017 |  | 2016 |  | 2015 |  | Statement |
Gains (losses) associated with defined benefit pension and postretirement plans amortization |  |  |  |  |  |  |  |  |  |  |  |  |
Transition asset |  |  | $ | — |  | $ | 1 |  | $ | 1 |  | See Note 12 |
Prior service benefit |  |  |  | 89 |  |  | 92 |  |  | 79 |  | See Note 12 |
Net actuarial loss |  |  |  | (570) |  |  | (506) |  |  | (626) |  | See Note 12 |
Curtailments/Settlements |  |  |  | (2) |  |  | (8) |  |  | 9 |  | See Note 12 |
Total before tax |  |  |  | (483) |  |  | (421) |  |  | (537) |  |  |
Tax effect |  |  |  | 116 |  |  | 148 |  |  | 176 |  | Provision for income taxes |
Net of tax |  |  | $ | (367) |  | $ | (273) |  | $ | (361) |  |  |
Cash flow hedging instruments gains (losses) |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency forward/option contracts |  |  | $ | 8 |  | $ | 110 |  | $ | 178 |  | Cost of sales |
Commodity price swap contracts |  |  |  | — |  |  | — |  |  | (2) |  | Cost of sales |
Interest rate swap contracts |  |  |  | (1) |  |  | (1) |  |  | (2) |  | Interest expense |
Total before tax |  |  |  | 7 |  |  | 109 |  |  | 174 |  |  |
Tax effect |  |  |  | (3) |  |  | (39) |  |  | (63) |  | Provision for income taxes |
Net of tax |  |  | $ | 4 |  | $ | 70 |  | $ | 111 |  |  |
Total reclassifications for the period, net of tax |  |  | $ | (363) |  | $ | (203) |  | $ | (250) |  |  |

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