Supplemental Equity and Comprehensive Income Information (Tables)

12 Months Ended

Dec. 31, 2020

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, 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
Impact from purchase of subsidiary shares		1		—		—		1
Balance at December 31, 2018, net of tax:	$	(2,098)	$	(4,832)	$	64	$	(6,866)
Impact of adoption of ASU No. 2018-02		(13)		(817)		(23)		(853)
Other comprehensive income (loss), before tax:
Amounts before reclassifications		102		(1,227)		(26)		(1,151)
Amounts reclassified out		142		459		(70)		531
Total other comprehensive income (loss), before tax		244		(768)		(96)		(620)
Tax effect		(32)		208		24		200
Total other comprehensive income (loss), net of tax		212		(560)		(72)		(420)
Balance at December 31, 2019, net of tax:	$	(1,899)	$	(6,209)	$	(31)	$	(8,139)
Other comprehensive income (loss), before tax:
Amounts before reclassifications		387		(555)		(113)		(281)
Amounts reclassified out		—		676		(71)		605
Total other comprehensive income (loss), before tax		387		121		(184)		324
Tax effect		62		50		42		154
Total other comprehensive income (loss), net of tax		449		171		(142)		478
Balance at December 31, 2020, net of tax:	$	(1,450)	$	(6,038)	$	(173)	$	(7,661)

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)	2020		2019		2018		Statement
Cumulative translation adjustment
Deconsolidation of Venezuelan subsidiary	$	—	$	(142)	$	—	Other (expense) income, net
Total before tax		—		(142)		—
Tax effect		—		—		—	Provision for income taxes
Net of tax	$	—	$	(142)	$	—
Defined benefit pension and postretirement plans adjustments
Gains (losses) associated with defined benefit pension and postretirement plans amortization
Transition asset	$	(2)	$	—	$	—	See Note 13
Prior service benefit		62		69		76	See Note 13
Net actuarial loss		(716)		(478)		(678)	See Note 13
Curtailments/Settlements		(20)		(48)		(4)	See Note 13
Deconsolidation of Venezuelan subsidiary		—		(2)		—	Other (expense) income, net
Total before tax		(676)		(459)		(606)
Tax effect		161		110		145	Provision for income taxes
Net of tax	$	(515)	$	(349)	$	(461)
Cash flow hedging instruments gains (losses)
Foreign currency forward/option contracts	$	80	$	74	$	(95)	Cost of sales
Interest rate contracts		(9)		(4)		(1)	Interest expense
Total before tax		71		70		(96)
Tax effect		(17)		(17)		19	Provision for income taxes
Net of tax	$	54	$	53	$	(77)
Total reclassifications for the period, net of tax	$	(461)	$	(438)	$	(538)