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Supplemental Equity and Comprehensive Income Information - AOCI rf (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 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 | $ 10,083 |  | 10,083 |
ASU 2016-02 Leases |  |  |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |
Impact of ASUs | 14 |  | 14 |
Other comprehensive income (loss), before tax: |  |  |  |
Impact of ASUs | 14 |  | 14 |
Cumulative Translation Adjustment |  |  |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |
Stockholders' Equity Attributable to 3M, Beginning Balance | (2,034) | $ (1,470) | (2,098) | $ (1,638)
Other comprehensive income (loss), before tax: |  |  |  |
Amounts before reclassifications | (40) | (411) | 63 | (282)
Amounts reclassified out | 142 |  | 142 |
Total other comprehensive income (loss), before tax | 102 | (411) | 205 | (282)
Tax effect | 20 | (81) | (6) | (42)
Total other comprehensive income (loss), net of tax | 122 | (492) | 199 | (324)
Stockholders' Equity Attributable to 3M, Ending Balance | (1,912) | (1,962) | (1,912) | (1,962)
Cumulative Translation Adjustment | ASU 2016-02 Leases |  |  |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |
Impact of ASUs | (13) |  | (13) |
Other comprehensive income (loss), before tax: |  |  |  |
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 | (5,565) | (5,160) | (4,832) | (5,276)
Other comprehensive income (loss), before tax: |  |  |  |
Amounts before reclassifications | 153 |  | 153 |
Amounts reclassified out | 105 | 151 | 209 | 302
Total other comprehensive income (loss), before tax | 258 | 151 | 362 | 302
Tax effect | (62) | (37) | (82) | (72)
Total other comprehensive income (loss), net of tax | 196 | 114 | 280 | 230
Stockholders' Equity Attributable to 3M, Ending Balance | (5,369) | (5,046) | (5,369) | (5,046)
Defined Pension and Postretirement Plans Adjustment | ASU 2016-02 Leases |  |  |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |
Impact of ASUs | (817) |  | (817) |
Other comprehensive income (loss), before tax: |  |  |  |
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 | 47 | (173) | 64 | (112)
Other comprehensive income (loss), before tax: |  |  |  |
Amounts before reclassifications | (30) | 182 | (17) | 100
Amounts reclassified out | (20) | 28 | (27) | 62
Total other comprehensive income (loss), before tax | (50) | 210 | (44) | 162
Tax effect | 12 | (48) | 12 | (61)
Total other comprehensive income (loss), net of tax | (38) | 162 | (32) | 101
Stockholders' Equity Attributable to 3M, Ending Balance | 9 | (11) | 9 | (11)
Cash Flow Hedging Instruments, Unrealized Gain (Loss) | ASU 2016-02 Leases |  |  |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |
Impact of ASUs | (23) |  | (23) |
Other comprehensive income (loss), before tax: |  |  |  |
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 | (7,552) | (6,803) | (6,866) | (7,026)
Other comprehensive income (loss), before tax: |  |  |  |
Amounts before reclassifications | 83 | (229) | 199 | (182)
Amounts reclassified out | 227 | 179 | 324 | 364
Total other comprehensive income (loss), before tax | 310 | (50) | 523 | 182
Tax effect | (30) | (166) | (76) | (175)
Total other comprehensive income (loss), net of tax | 280 | (216) | 447 | 7
Stockholders' Equity Attributable to 3M, Ending Balance | (7,272) | $ (7,019) | (7,272) | $ (7,019)
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) |
Other comprehensive income (loss), before tax: |  |  |  |
Impact of ASUs | (853) |  | (853) |
Total Accumulated Other Comprehensive Income (Loss) | ASU 2016-02 Leases |  |  |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |
Impact of ASUs | (853) |  | (853) |
Other comprehensive income (loss), before tax: |  |  |  |
Impact of ASUs | $ (853) |  | $ (853) |

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