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Supplemental Equity and Comprehensive Income Information - AOCI rf (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
AOCI Attributable to 3M, Net of Tax Roll Forward |  |
Stockholders' Equity Attributable to 3M, Beginning Balance | $ 9,796 |
Other comprehensive income (loss), before tax: |  |
Stockholders' Equity Attributable to 3M, Ending Balance | 9,703 |
ASU 2016-02 Leases |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |
Impact of ASUs | 14 |
Other comprehensive income (loss), before tax: |  |
Impact of ASUs | 14 |
Accumulated Other Comprehensive Income (Loss) |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |
Stockholders' Equity Attributable to 3M, Beginning Balance | (6,866) | $ (7,026)
Other comprehensive income (loss), before tax: |  |
Amounts before reclassifications | 116 | 47
Amounts reclassified out | 97 | 185
Total other comprehensive income (loss), before tax | 213 | 232
Tax effect | (46) | (9)
Total other comprehensive income (loss), net of tax | 167 | 223
Stockholders' Equity Attributable to 3M, Ending Balance | (7,552) | (6,803)
Accumulated Other Comprehensive Income (Loss) | ASU 2018-02 Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |
Impact of ASUs | (853) |
Other comprehensive income (loss), before tax: |  |
Impact of ASUs | (853) |
Accumulated Other Comprehensive Income (Loss) | ASU 2016-02 Leases |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |
Impact of ASUs | (853) |
Other comprehensive income (loss), before tax: |  |
Impact of ASUs | (853) |
Cumulative Translation Adjustment |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |
Stockholders' Equity Attributable to 3M, Beginning Balance | (2,098) | (1,638)
Other comprehensive income (loss), before tax: |  |
Amounts before reclassifications | 103 | 129
Total other comprehensive income (loss), before tax | 103 | 129
Tax effect | (26) | 39
Total other comprehensive income (loss), net of tax | 77 | 168
Stockholders' Equity Attributable to 3M, Ending Balance | (2,034) | (1,470)
Cumulative Translation Adjustment | ASU 2016-02 Leases |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |
Impact of ASUs | (13) |
Other comprehensive income (loss), before tax: |  |
Impact of ASUs | (13) |
Gains (losses) associated with defined benefit pension and postretirement plans amortization |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |
Stockholders' Equity Attributable to 3M, Beginning Balance | (4,832) | (5,276)
Other comprehensive income (loss), before tax: |  |
Amounts reclassified out | 104 | 151
Total other comprehensive income (loss), before tax | 104 | 151
Tax effect | (20) | (35)
Total other comprehensive income (loss), net of tax | 84 | 116
Stockholders' Equity Attributable to 3M, Ending Balance | (5,565) | (5,160)
Gains (losses) associated with defined benefit pension and postretirement plans amortization | ASU 2016-02 Leases |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |
Impact of ASUs | (817) |
Other comprehensive income (loss), before tax: |  |
Impact of ASUs | (817) |
Cash flow hedging instruments gains (losses) |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |
Stockholders' Equity Attributable to 3M, Beginning Balance | 64 | (112)
Other comprehensive income (loss), before tax: |  |
Amounts before reclassifications | 13 | (82)
Amounts reclassified out | (7) | 34
Total other comprehensive income (loss), before tax | 6 | (48)
Tax effect |  | (13)
Total other comprehensive income (loss), net of tax | 6 | (61)
Stockholders' Equity Attributable to 3M, Ending Balance | 47 | $ (173)
Cash flow hedging instruments gains (losses) | ASU 2016-02 Leases |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |
Impact of ASUs | (23) |
Other comprehensive income (loss), before tax: |  |
Impact of ASUs | $ (23) |

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