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Supplemental Equity and Comprehensive Income Information - AOCI rf (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |
Stockholders' Equity Attributable to 3M, Beginning Balance |  |  | $ 11,563 |
Other comprehensive income (loss), before tax: |  |  |  |
Stockholders' Equity Attributable to 3M, Ending Balance | $ 10,248 |  | 10,248 |
Accumulated Other Comprehensive Income (Loss) |  |  |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |
Stockholders' Equity Attributable to 3M, Beginning Balance | (7,019) | $ (6,989) | (7,026) | $ (7,245)
Other comprehensive income (loss), before tax: |  |  |  |
Amounts before reclassifications | (88) | (109) | (270) | (225)
Amounts reclassified out | 187 | 121 | 551 | 336
Total other comprehensive income (loss), before tax | 99 | 12 | 281 | 111
Tax effect | (48) | 64 | (223) | 221
Total other comprehensive income (loss), net of tax | 51 | 76 | 58 | 332
Stockholders' Equity Attributable to 3M, Ending Balance | (6,968) | (6,913) | (6,968) | (6,913)
Cumulative Translation Adjustment |  |  |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |
Stockholders' Equity Attributable to 3M, Beginning Balance | (1,962) | (1,786) | (1,638) | (2,008)
Other comprehensive income (loss), before tax: |  |  |  |
Amounts before reclassifications | (110) | (29) | (392) | 30
Total other comprehensive income (loss), before tax | (110) | (29) | (392) | 30
Tax effect | 1 | 74 | (41) | 237
Total other comprehensive income (loss), net of tax | (109) | 45 | (433) | 267
Stockholders' Equity Attributable to 3M, Ending Balance | (2,071) | (1,741) | (2,071) | (1,741)
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 | (5,046) | (5,167) | (5,276) | (5,328)
Other comprehensive income (loss), before tax: |  |  |  |
Amounts reclassified out | 150 | 119 | 452 | 357
Total other comprehensive income (loss), before tax | 150 | 119 | 452 | 357
Tax effect | (36) | (39) | (108) | (116)
Total other comprehensive income (loss), net of tax | 114 | 80 | 344 | 241
Stockholders' Equity Attributable to 3M, Ending Balance | (4,932) | (5,087) | (4,932) | (5,087)
Cash flow hedging instruments gains (losses) |  |  |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |
Stockholders' Equity Attributable to 3M, Beginning Balance | (11) | (36) | (112) | 91
Other comprehensive income (loss), before tax: |  |  |  |
Amounts before reclassifications | 22 | (80) | 122 | (255)
Amounts reclassified out | 37 | 2 | 99 | (21)
Total other comprehensive income (loss), before tax | 59 | (78) | 221 | (276)
Tax effect | (13) | 29 | (74) | 100
Total other comprehensive income (loss), net of tax | 46 | (49) | 147 | (176)
Stockholders' Equity Attributable to 3M, Ending Balance | $ 35 | $ (85) | $ 35 | $ (85)

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