Supplemental Equity and Comprehensive Income Information (Tables)

12 Months Ended

Dec. 31, 2018

Supplemental Equity and Comprehensive Income Information

Changes in Accumulated Other Comprehensive Income (Loss) Attributable to 3M

Changes in Accumulated Other Comprehensive Income (Loss) Attributable to 3M by Component

			Defined Benefit		Cash Flow		Total
			Pension and		Hedging		Accumulated
	Cumulative		Postretirement		Instruments,		Other
	Translation		Plans		Unrealized		Comprehensive
(Millions)	Adjustment		Adjustment		Gain (Loss)		Income (Loss)
Balance at December 31, 2015, net of tax:	$	(1,679)	$	(4,804)	$	124	$	(6,359)
Other comprehensive income (loss), before tax:
Amounts before reclassifications		(244)		(1,122)		57		(1,309)
Amounts reclassified out		—		421		(109)		312
Total other comprehensive income (loss), before tax		(244)		(701)		(52)		(997)
Tax effect		(85)		177		19		111
Total other comprehensive income (loss), net of tax		(329)		(524)		(33)		(886)
Balance at December 31, 2016, net of tax:	$	(2,008)	$	(5,328)	$	91	$	(7,245)
Other comprehensive income (loss), before tax:
Amounts before reclassifications		91		(600)		(311)		(820)
Amounts reclassified out		—		483		(7)		476
Total other comprehensive income (loss), before tax		91		(117)		(318)		(344)
Tax effect		279		169		115		563
Total other comprehensive income (loss), net of tax		370		52		(203)		219
Balance at December 31, 2017, net of tax:	$	(1,638)	$	(5,276)	$	(112)	$	(7,026)
Other comprehensive income (loss), before tax:
Amounts before reclassifications		(414)		55		133		(226)
Amounts reclassified out		—		606		96		702
Total other comprehensive income (loss), before tax		(414)		661		229		476
Tax effect		(47)		(217)		(53)		(317)
Total other comprehensive income (loss), net of tax		(461)		444		176		159
Transfer of ownership involving non-wholly owned subsidiaries		1		—		—		1
Balance at December 31, 2018, net of tax:	$	(2,098)	$	(4,832)	$	64	$	(6,866)

Reclassifications Out of Accumulated Other Comprehensive Income

Reclassifications out of Accumulated Other Comprehensive Income Attributable to 3M

	Amounts Reclassified from
Details about Accumulated Other	Accumulated Other Comprehensive Income
Comprehensive Income Components	Year ended December 31,						Location on Income
(Millions)	2018		2017		2016		Statement
Gains (losses) associated with defined benefit pension and postretirement plans amortization
Transition asset	$	—	$	—	$	1	See Note 13
Prior service benefit		76		89		92	See Note 13
Net actuarial loss		(678)		(570)		(506)	See Note 13
Curtailments/Settlements		(4)		(2)		(8)	See Note 13
Total before tax		(606)		(483)		(421)
Tax effect		145		116		148	Provision for income taxes
Net of tax	$	(461)	$	(367)	$	(273)
Cash flow hedging instruments gains (losses)
Foreign currency forward/option contracts	$	(95)	$	8	$	110	Cost of sales
Interest rate swap contracts		(1)		(1)		(1)	Interest expense
Total before tax		(96)		7		109
Tax effect		19		(3)		(39)	Provision for income taxes
Net of tax	$	(77)	$	4	$	70
Total reclassifications for the period, net of tax	$	(538)	$	(363)	$	(203)