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Supplemental Equity and Comprehensive Income (Loss) Information (Tables) | 12 Months Ended
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Dec. 31, 2023
Stockholders' Equity Note [Abstract] |
Schedule of Changes in Accumulated Other Comprehensive Income (Loss) Attributable to 3M |
(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, 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 (1) |  | (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) |
Other comprehensive income (loss), before tax: |  |  |  |  |  |  |  |
Amounts before reclassifications |  | (850) |  |  | 866 |  |  | 159 |  |  | 175 |
Amounts reclassified out |  | — |  |  | 458 |  |  | (98) |  |  | 360 |
Total other comprehensive income (loss), before tax |  | (850) |  |  | 1,324 |  |  | 61 |  |  | 535 |
Tax effect (1) |  | (35) |  |  | (409) |  |  | (14) |  |  | (458) |
Total other comprehensive income (loss), net of tax |  | (885) |  |  | 915 |  |  | 47 |  |  | 77 |
Balance at December 31, 2022, net of tax: |  | $ | (2,828) |  |  | $ | (3,838) |  |  | $ | (7) |  |  | $ | (6,673) |
Other comprehensive income (loss), before tax: |  |  |  |  |  |  |  |
Amounts before reclassifications |  | 277 |  |  | (763) |  |  | 81 |  |  | (405) |
Amounts reclassified out |  | 54 |  |  | 252 |  |  | (143) |  |  | 163 |
Total other comprehensive income (loss), before tax |  | 331 |  |  | (511) |  |  | (62) |  |  | (242) |
Tax effect (1) |  | (9) |  |  | 131 |  |  | 15 |  |  | 137 |
Total other comprehensive income (loss), net of tax |  | 322 |  |  | (380) |  |  | (47) |  |  | (105) |
Balance at December 31, 2023, net of tax: |  | $ | (2,506) |  |  | $ | (4,218) |  |  | $ | (54) |  |  | $ | (6,778) |
(1) Includes tax expense (benefit) reclassified out of AOCI related to the following:
| (millions) |  | 2023 |  | 2022 |  | 2021 |
| Defined benefit pension and postretirement plans adjustment |  | (60) |  |  | $ | (108) |  |  | $ | (160) |  |
| Cash flow hedging instruments, unrealized gain/loss |  | 33 |  |  | 23 |  |  | (11) |  |

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