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Supplemental Equity and Comprehensive Income Information - AOCI rf (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 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	$ 10,702		10,702
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	(1,912)	$ (1,962)	(2,098)	$ (1,638)
Other comprehensive income (loss), before tax:
Amounts before reclassifications	(149)	(110)	(86)	(392)
Amounts reclassified out			142
Total other comprehensive income (loss), before tax	(149)	(110)	56	(392)
Tax effect	(51)	1	(57)	(41)
Total other comprehensive income (loss), net of tax	(200)	(109)	(1)	(433)
Stockholders' Equity Attributable to 3M, Ending Balance	(2,112)	(2,071)	(2,112)	(2,071)
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	(5,369)	(5,046)	(4,832)	(5,276)
Other comprehensive income (loss), before tax:
Amounts before reclassifications			153
Amounts reclassified out	101	150	310	452
Total other comprehensive income (loss), before tax	101	150	463	452
Tax effect	(25)	(36)	(107)	(108)
Total other comprehensive income (loss), net of tax	76	114	356	344
Stockholders' Equity Attributable to 3M, Ending Balance	(5,293)	(4,932)	(5,293)	(4,932)
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	9	(11)	64	(112)
Other comprehensive income (loss), before tax:
Amounts before reclassifications	31	22	14	122
Amounts reclassified out	(21)	37	(48)	99
Total other comprehensive income (loss), before tax	10	59	(34)	221
Tax effect	(2)	(13)	10	(74)
Total other comprehensive income (loss), net of tax	8	46	(24)	147
Stockholders' Equity Attributable to 3M, Ending Balance	17	35	17	35
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	(7,272)	(7,019)	(6,866)	(7,026)
Other comprehensive income (loss), before tax:
Amounts before reclassifications	(118)	(88)	81	(270)
Amounts reclassified out	80	187	404	551
Total other comprehensive income (loss), before tax	(38)	99	485	281
Tax effect	(78)	(48)	(154)	(223)
Total other comprehensive income (loss), net of tax	(116)	51	331	58
Stockholders' Equity Attributable to 3M, Ending Balance	(7,388)	$ (6,968)	(7,388)	$ (6,968)
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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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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