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Supplemental Equity and Comprehensive Income Information - AOCI rf (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |
Balance at the beginning of the period | $ 13,828 | $ 10,214 | $ 12,931 | $ 10,126
Other comprehensive income (loss), before tax: |  |  |  |
Balance at the end of the period | 14,516 | 10,925 | 14,516 | 10,925
Cumulative Translation Adjustment |  |  |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |
Balance at the beginning of the period | (1,673) | (2,340) | (1,450) | (1,899)
Other comprehensive income (loss), before tax: |  |  |  |
Amounts before reclassifications | 159 | 104 | (17) | (335)
Total other comprehensive income (loss), before tax | 159 | 104 | (17) | (335)
Tax effect | 12 | 2 | (35) |
Total other comprehensive income (loss), net of tax | 171 | 106 | (52) | (335)
Balance at the end of the period | (1,502) | (2,234) | (1,502) | (2,234)
Defined Pension and Postretirement Plans Adjustment |  |  |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |
Balance at the beginning of the period | (5,979) | (6,096) | (6,098) | (6,204)
Other comprehensive income (loss), before tax: |  |  |  |
Amounts before reclassifications |  | (80) |  | (80)
Amounts reclassified out | 160 | 147 | 319 | 297
Total other comprehensive income (loss), before tax | 160 | 67 | 319 | 217
Tax effect | (39) | (20) | (79) | (62)
Total other comprehensive income (loss), net of tax | 121 | 47 | 240 | 155
Balance at the end of the period | (5,858) | (6,049) | (5,858) | (6,049)
Cash Flow Hedging Instruments, Unrealized Gain (Loss) |  |  |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |
Balance at the beginning of the period | (115) | 16 | (173) | (31)
Other comprehensive income (loss), before tax: |  |  |  |
Amounts before reclassifications | (26) | (15) | 40 | 62
Amounts reclassified out | 12 | (31) | 21 | (47)
Total other comprehensive income (loss), before tax | (14) | (46) | 61 | 15
Tax effect | 3 | 10 | (14) | (4)
Total other comprehensive income (loss), net of tax | (11) | (36) | 47 | 11
Balance at the end of the period | (126) | (20) | (126) | (20)
Retained Earnings |  |  |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |
Balance at the beginning of the period | 44,255 | 42,356 | 43,821 | 42,130
Other comprehensive income (loss), before tax: |  |  |  |
Balance at the end of the period | 44,824 | 42,786 | 44,824 | 42,786
Total Accumulated Other Comprehensive Income (Loss) |  |  |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |  |  |
Balance at the beginning of the period | (7,767) | (8,420) | (7,721) | (8,134)
Other comprehensive income (loss), before tax: |  |  |  |
Amounts before reclassifications | 133 | 9 | 23 | (353)
Amounts reclassified out | 172 | 116 | 340 | 250
Total other comprehensive income (loss), before tax | 305 | 125 | 363 | (103)
Tax effect | (24) | (8) | (128) | (66)
Total other comprehensive income (loss), net of tax | 281 | 117 | 235 | (169)
Balance at the end of the period | $ (7,486) | $ (8,303) | $ (7,486) | $ (8,303)

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