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Supplemental Equity and Comprehensive Income Information (Tables) | 12 Months Ended
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Dec. 31, 2021
Stockholders' Equity Note [Abstract] |
Changes in accumulated other comprehensive income (loss) attributable to 3M | Changes in Accumulated Other Comprehensive Income (Loss) Attributable to 3M by Component
(Millions) |  | Cumulative Translation Adjustment |  | Defined Benefit Pension and Postretirement Plans Adjustment |  | Cash Flow Hedging Instruments, Unrealized Gain (Loss) |  | Total Accumulated Other Comprehensive Income (Loss)
Balance at December 31, 2018, net of tax: |  | $ | (2,098) |  |  | $ | (4,880) |  |  | $ | 64 |  |  | $ | (6,914) |
Impact of Adoption of ASU No. 2018-02 |  | (13) |  |  | (817) |  |  | (23) |  |  | (853) |
Other comprehensive income (loss), before tax: |  |  |  |  |  |  |  |
Amounts before reclassifications |  | 102 |  |  | (1,205) |  |  | (26) |  |  | (1,129) |
Amounts reclassified out |  | 142 |  |  | 505 |  |  | (70) |  |  | 577 |
Total other comprehensive income (loss), before tax |  | 244 |  |  | (700) |  |  | (96) |  |  | (552) |
Tax effect |  | (32) |  |  | 193 |  |  | 24 |  |  | 185 |
Total other comprehensive income (loss), net of tax |  | 212 |  |  | (507) |  |  | (72) |  |  | (367) |
Balance at December 31, 2019, net of tax: |  | (1,899) |  |  | (6,204) |  |  | (31) |  |  | (8,134) |
Other comprehensive income (loss), before tax: |  |  |  |  |  |  |  |
Amounts before reclassifications |  | 387 |  |  | (582) |  |  | (113) |  |  | (308) |
Amounts reclassified out |  | — |  |  | 619 |  |  | (71) |  |  | 548 |
Total other comprehensive income (loss), before tax |  | 387 |  |  | 37 |  |  | (184) |  |  | 240 |
Tax effect |  | 62 |  |  | 69 |  |  | 42 |  |  | 173 |
Total other comprehensive income (loss), net of tax |  | 449 |  |  | 106 |  |  | (142) |  |  | 413 |
Balance at December 31, 2020, net of tax: |  | $ | (1,450) |  |  | $ | (6,098) |  |  | $ | (173) |  |  | $ | (7,721) |
Other comprehensive income (loss), before tax: |  |  |  |  |  |  |  |
Amounts before reclassifications |  | (428) |  |  | 1,223 |  |  | 108 |  |  | 903 |
Amounts reclassified out |  | — |  |  | 658 |  |  | 47 |  |  | 705 |
Total other comprehensive income (loss), before tax |  | (428) |  |  | 1,881 |  |  | 155 |  |  | 1,608 |
Tax effect |  | (65) |  |  | (536) |  |  | (36) |  |  | (637) |
Total other comprehensive income (loss), net of tax |  | (493) |  |  | 1,345 |  |  | 119 |  |  | 971 |
Balance at December 31, 2021, net of tax: |  | $ | (1,943) |  |  | $ | (4,753) |  |  | $ | (54) |  |  | $ | (6,750) |
Reclassifications out of accumulated other comprehensive income | Reclassifications out of Accumulated Other Comprehensive Income Attributable to 3M
Details about Accumulated Other Comprehensive Income Components (Millions) |  | Amounts Reclassified from Accumulated Other Comprehensive Income |  | Location on Income Statement
Year ended December 31,
2021 |  | 2020 |  | 2019
Cumulative translation adjustment |  |  |  |  |  |  |  |
Deconsolidation of Venezuelan subsidiary |  | $ | — |  |  | $ | — |  |  | $ | (142) |  |  | Other (expense) income, net
Total before tax |  | — |  |  | — |  |  | (142) |  |  |
Tax effect |  | — |  |  | — |  |  | — |  |  | Provision for income taxes
Net of tax |  | — |  |  | — |  |  | (142) |  |  |
Defined benefit pension and postretirement plans adjustments |  |  |  |  |  |  |  |
Gains (losses) associated with defined benefit pension and postretirement plans amortization |  |  |  |  |  |  |  |
Transition asset |  | (2) |  |  | (2) |  |  | — |  |  | Other (expense) income, net
Prior service benefit |  | 60 |  |  | 62 |  |  | 69 |  |  | Other (expense) income, net
Net actuarial loss |  | (689) |  |  | (659) |  |  | (524) |  |  | Other (expense) income, net
Curtailments/Settlements |  | (27) |  |  | (20) |  |  | (48) |  |  | Other (expense) income, net
Deconsolidation of Venezuelan subsidiary |  | — |  |  | — |  |  | (2) |  |  | Other (expense) income, net
Total before tax |  | (658) |  |  | (619) |  |  | (505) |  |  |
Tax effect |  | 160 |  |  | 148 |  |  | 121 |  |  | Provision for income taxes
Net of tax |  | (498) |  |  | (471) |  |  | (384) |  |  |
Cash flow hedging instruments gains (losses) |  |  |  |  |  |  |  |
Foreign currency forward/option contracts |  | (38) |  |  | 80 |  |  | 74 |  |  | Cost of sales
Interest rate contracts |  | (9) |  |  | (9) |  |  | (4) |  |  | Interest expense
Total before tax |  | (47) |  |  | 71 |  |  | 70 |  |  |
Tax effect |  | 11 |  |  | (17) |  |  | (17) |  |  | Provision for income taxes
Net of tax |  | (36) |  |  | 54 |  |  | 53 |  |  |
Total reclassifications for the period, net of tax |  | $ | (534) |  |  | $ | (417) |  |  | $ | (473) |  |  |

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