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Supplemental Equity and Comprehensive Income Information - AOCI rf (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to 3M, Beginning Balance |  |  | $ 10,063 |  |  |  |  |
Impact of ASUs | $ 11,943 | $ 10,764 | 11,943 | $ 10,764 | $ 10,915 | $ 10,126 | $ 10,142 | $ 9,848
Other comprehensive income (loss), before tax: |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to 3M, Ending Balance | 11,880 |  | 11,880 |  |  |  |  |
Cumulative Translation Adjustment |  |  |  |  |  |  |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to 3M, Beginning Balance | (2,234) | (1,912) | (1,899) | (2,098) |  |  |  |
Other comprehensive income (loss), before tax: |  |  |  |  |  |  |  |
Amounts before reclassifications | 237 | (149) | (98) | (86) |  |  |  |
Amounts reclassified out |  |  |  | 142 |  |  |  |
Total other comprehensive income (loss), before tax | 237 | (149) | (98) | 56 |  |  |  |
Tax effect | 33 | (51) | 33 | (57) |  |  |  |
Total other comprehensive income (loss), net of tax | 270 | (200) | (65) | (1) |  |  |  |
Stockholders' Equity Attributable to 3M, Ending Balance | (1,964) | (2,112) | (1,964) | (2,112) |  |  |  |
Cumulative Translation Adjustment | ASU 2018-02 Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |  |  |  |  |
Impact of ASUs |  | (13) |  | (13) |  |  |  |
Defined Pension and Postretirement Plans Adjustment |  |  |  |  |  |  |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to 3M, Beginning Balance | (6,032) | (5,369) | (6,209) | (4,832) |  |  |  |
Other comprehensive income (loss), before tax: |  |  |  |  |  |  |  |
Amounts before reclassifications |  |  | (80) | 153 |  |  |  |
Amounts reclassified out | 163 | 101 | 489 | 310 |  |  |  |
Total other comprehensive income (loss), before tax | 163 | 101 | 409 | 463 |  |  |  |
Tax effect | (36) | (25) | (105) | (107) |  |  |  |
Total other comprehensive income (loss), net of tax | 127 | 76 | 304 | 356 |  |  |  |
Stockholders' Equity Attributable to 3M, Ending Balance | (5,905) | (5,293) | (5,905) | (5,293) |  |  |  |
Defined Pension and Postretirement Plans Adjustment | ASU 2018-02 Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |  |  |  |  |
Impact of ASUs |  | (817) |  | (817) |  |  |  |
Cash Flow Hedging Instruments, Unrealized Gain (Loss) |  |  |  |  |  |  |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to 3M, Beginning Balance | (20) | 9 | (31) | 64 |  |  |  |
Other comprehensive income (loss), before tax: |  |  |  |  |  |  |  |
Amounts before reclassifications | (72) | 31 | (10) | 14 |  |  |  |
Amounts reclassified out | (21) | (21) | (68) | (48) |  |  |  |
Total other comprehensive income (loss), before tax | (93) | 10 | (78) | (34) |  |  |  |
Tax effect | 22 | (2) | 18 | 10 |  |  |  |
Total other comprehensive income (loss), net of tax | (71) | 8 | (60) | (24) |  |  |  |
Stockholders' Equity Attributable to 3M, Ending Balance | (91) | 17 | (91) | 17 |  |  |  |
Cash Flow Hedging Instruments, Unrealized Gain (Loss) | ASU 2018-02 Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |  |  |  |  |
Impact of ASUs |  | (23) |  | (23) |  |  |  |
Total Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to 3M, Beginning Balance | (8,286) | (7,272) | (8,139) | (6,866) |  |  |  |
Impact of ASUs | (7,960) | (7,388) | (7,960) | (7,388) | $ (8,286) | $ (8,139) | $ (7,272) | (6,866)
Other comprehensive income (loss), before tax: |  |  |  |  |  |  |  |
Amounts before reclassifications | 165 | (118) | (188) | 81 |  |  |  |
Amounts reclassified out | 142 | 80 | 421 | 404 |  |  |  |
Total other comprehensive income (loss), before tax | 307 | (38) | 233 | 485 |  |  |  |
Tax effect | 19 | (78) | (54) | (154) |  |  |  |
Total other comprehensive income (loss), net of tax | 326 | (116) | 179 | 331 |  |  |  |
Stockholders' Equity Attributable to 3M, Ending Balance | $ (7,960) | (7,388) | $ (7,960) | (7,388) |  |  |  |
Total Accumulated Other Comprehensive Income (Loss) | ASU 2018-02 Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |  |  |  |  |
Impact of ASUs |  | $ (853) |  | $ (853) |  |  |  | $ (853)

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