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Supplemental Equity and Comprehensive Income Information - AOCI rf (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 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 | 10,977 |
Accumulated Other Comprehensive Income (Loss) |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |
Stockholders' Equity Attributable to 3M, Beginning Balance | (7,026) | $ (7,245)
Other comprehensive income (loss), before tax: |  |
Amounts before reclassifications | 47 | 125
Amounts reclassified out | 185 | 101
Total other comprehensive income (loss), before tax | 232 | 226
Tax effect | (9) | 70
Total other comprehensive income (loss), net of tax | 223 | 296
Stockholders' Equity Attributable to 3M, Ending Balance | (6,803) | (6,949)
Cumulative Translation Adjustment |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |
Stockholders' Equity Attributable to 3M, Beginning Balance | (1,638) | (2,008)
Other comprehensive income (loss), before tax: |  |
Amounts before reclassifications | 129 | 226
Total other comprehensive income (loss), before tax | 129 | 226
Tax effect | 39 | 63
Total other comprehensive income (loss), net of tax | 168 | 289
Stockholders' Equity Attributable to 3M, Ending Balance | (1,470) | (1,719)
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 | (5,276) | (5,328)
Other comprehensive income (loss), before tax: |  |
Amounts reclassified out | 151 | 119
Total other comprehensive income (loss), before tax | 151 | 119
Tax effect | (35) | (36)
Total other comprehensive income (loss), net of tax | 116 | 83
Stockholders' Equity Attributable to 3M, Ending Balance | (5,160) | (5,245)
Cash flow hedging instruments gains (losses) |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |
Stockholders' Equity Attributable to 3M, Beginning Balance | (112) | 91
Other comprehensive income (loss), before tax: |  |
Amounts before reclassifications | (82) | (101)
Amounts reclassified out | 34 | (18)
Total other comprehensive income (loss), before tax | (48) | (119)
Tax effect | (13) | 43
Total other comprehensive income (loss), net of tax | (61) | (76)
Stockholders' Equity Attributable to 3M, Ending Balance | $ (173) | $ 15

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