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Supplemental Equity and Comprehensive Income Information - AOCI rf (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 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 | $ 10,857 |  | 10,857 |
Cumulative Translation Adjustment |  |  |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |
Stockholders' Equity Attributable to 3M, Beginning Balance | (2,340) | $ (2,034) | (1,899) | $ (2,098)
Other comprehensive income (loss), before tax: |  |  |  |
Amounts before reclassifications | 104 | (40) | (335) | 63
Amounts reclassified out |  | 142 |  | 142
Total other comprehensive income (loss), before tax | 104 | 102 | (335) | 205
Tax effect | 2 | 20 |  | (6)
Total other comprehensive income (loss), net of tax | 106 | 122 | (335) | 199
Stockholders' Equity Attributable to 3M, Ending Balance | (2,234) | (1,912) | (2,234) | (1,912)
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) |  | (13)
Defined Pension and Postretirement Plans Adjustment |  |  |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |
Stockholders' Equity Attributable to 3M, Beginning Balance | (6,090) | (5,565) | (6,209) | (4,832)
Other comprehensive income (loss), before tax: |  |  |  |
Amounts before reclassifications | (80) | 153 | (80) | 153
Amounts reclassified out | 162 | 105 | 326 | 209
Total other comprehensive income (loss), before tax | 82 | 258 | 246 | 362
Tax effect | (24) | (62) | (69) | (82)
Total other comprehensive income (loss), net of tax | 58 | 196 | 177 | 280
Stockholders' Equity Attributable to 3M, Ending Balance | (6,032) | (5,369) | (6,032) | (5,369)
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) |  | (817)
Cash Flow Hedging Instruments, Unrealized Gain (Loss) |  |  |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |
Stockholders' Equity Attributable to 3M, Beginning Balance | 16 | 47 | (31) | 64
Other comprehensive income (loss), before tax: |  |  |  |
Amounts before reclassifications | (15) | (30) | 62 | (17)
Amounts reclassified out | (31) | (20) | (47) | (27)
Total other comprehensive income (loss), before tax | (46) | (50) | 15 | (44)
Tax effect | 10 | 12 | (4) | 12
Total other comprehensive income (loss), net of tax | (36) | (38) | 11 | (32)
Stockholders' Equity Attributable to 3M, Ending Balance | (20) | 9 | (20) | 9
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) |  | (23)
Total Accumulated Other Comprehensive Income (Loss) |  |  |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |
Stockholders' Equity Attributable to 3M, Beginning Balance | (8,414) | (7,552) | (8,139) | (6,866)
Other comprehensive income (loss), before tax: |  |  |  |
Amounts before reclassifications | 9 | 83 | (353) | 199
Amounts reclassified out | 131 | 227 | 279 | 324
Total other comprehensive income (loss), before tax | 140 | 310 | (74) | 523
Tax effect | (12) | (30) | (73) | (76)
Total other comprehensive income (loss), net of tax | 128 | 280 | (147) | 447
Stockholders' Equity Attributable to 3M, Ending Balance | $ (8,286) | (7,272) | $ (8,286) | (7,272)
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) |  | $ (853)

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