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Supplemental Equity and Comprehensive Income Information - AOCI rf (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
AOCI Attributable to 3M, Net of Tax Roll Forward |  |
Stockholders' Equity Attributable to 3M, Beginning Balance | $ 10,063 |
Other comprehensive income (loss), before tax: |  |
Stockholders' Equity Attributable to 3M, Ending Balance | 10,147 |
Cumulative Translation Adjustment |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |
Stockholders' Equity Attributable to 3M, Beginning Balance | (1,899) | $ (2,098)
Other comprehensive income (loss), before tax: |  |
Amounts before reclassifications | (439) | 103
Total other comprehensive income (loss), before tax | (439) | 103
Tax effect | (2) | (26)
Total other comprehensive income (loss), net of tax | (441) | 77
Stockholders' Equity Attributable to 3M, Ending Balance | (2,340) | (2,034)
Cumulative Translation Adjustment | 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 |  | (13)
Defined Pension and Postretirement Plans Adjustment |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |
Stockholders' Equity Attributable to 3M, Beginning Balance | (6,209) | (4,832)
Other comprehensive income (loss), before tax: |  |
Amounts reclassified out | 164 | 104
Total other comprehensive income (loss), before tax | 164 | 104
Tax effect | (45) | (20)
Total other comprehensive income (loss), net of tax | 119 | 84
Stockholders' Equity Attributable to 3M, Ending Balance | (6,090) | (5,565)
Defined Pension and Postretirement Plans Adjustment | 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 |  | (817)
Cash Flow Hedging Instruments, Unrealized Gain (Loss) |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |
Stockholders' Equity Attributable to 3M, Beginning Balance | (31) | 64
Other comprehensive income (loss), before tax: |  |
Amounts before reclassifications | 77 | 13
Amounts reclassified out | (16) | (7)
Total other comprehensive income (loss), before tax | 61 | 6
Tax effect | (14) |
Total other comprehensive income (loss), net of tax | 47 | 6
Stockholders' Equity Attributable to 3M, Ending Balance | 16 | 47
Cash Flow Hedging Instruments, Unrealized Gain (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 |  | (23)
Total Accumulated Other Comprehensive Income (Loss) |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |
Stockholders' Equity Attributable to 3M, Beginning Balance | (8,139) | (6,866)
Other comprehensive income (loss), before tax: |  |
Amounts before reclassifications | (362) | 116
Amounts reclassified out | 148 | 97
Total other comprehensive income (loss), before tax | (214) | 213
Tax effect | (61) | (46)
Total other comprehensive income (loss), net of tax | (275) | 167
Stockholders' Equity Attributable to 3M, Ending Balance | $ (8,414) | (7,552)
Total 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)

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