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Supplemental Equity and Comprehensive Income Information - AOCI rf (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
AOCI Attributable to 3M, Net of Tax Roll Forward |  |
Balance at the beginning of the period | $ 12,931 | $ 10,126
Other comprehensive income (loss), before tax: |  |
Balance at the end of the period | 13,828 | 10,214
Cumulative Translation Adjustment |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |
Balance at the beginning of the period | (1,450) | (1,899)
Other comprehensive income (loss), before tax: |  |
Amounts before reclassifications | (176) | (439)
Total other comprehensive income (loss), before tax | (176) | (439)
Tax effect | (47) | (2)
Total other comprehensive income (loss), net of tax | (223) | (441)
Balance at the end of the period | (1,673) | (2,340)
Defined Pension and Postretirement Plans Adjustment |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |
Balance at the beginning of the period | (6,098) | (6,204)
Other comprehensive income (loss), before tax: |  |
Amounts reclassified out | 159 | 150
Total other comprehensive income (loss), before tax | 159 | 150
Tax effect | (40) | (42)
Total other comprehensive income (loss), net of tax | 119 | 108
Balance at the end of the period | (5,979) | (6,096)
Cash Flow Hedging Instruments, Unrealized Gain (Loss) |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |
Balance at the beginning of the period | (173) | (31)
Other comprehensive income (loss), before tax: |  |
Amounts before reclassifications | 66 | 77
Amounts reclassified out | 9 | (16)
Total other comprehensive income (loss), before tax | 75 | 61
Tax effect | (17) | (14)
Total other comprehensive income (loss), net of tax | 58 | 47
Balance at the end of the period | (115) | 16
Retained Earnings |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |
Balance at the beginning of the period | 43,821 | 42,130
Other comprehensive income (loss), before tax: |  |
Balance at the end of the period | 44,255 | 42,356
Total Accumulated Other Comprehensive Income (Loss) |  |
AOCI Attributable to 3M, Net of Tax Roll Forward |  |
Balance at the beginning of the period | (7,721) | (8,134)
Other comprehensive income (loss), before tax: |  |
Amounts before reclassifications | (110) | (362)
Amounts reclassified out | 168 | 134
Total other comprehensive income (loss), before tax | 58 | (228)
Tax effect | (104) | (58)
Total other comprehensive income (loss), net of tax | (46) | (286)
Balance at the end of the period | $ (7,767) | $ (8,420)

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