3M CO - 10-Q filing on 2015-04-30

Derivatives (Details) In Millions, unless otherwise specified	3 Months Ended												1 Months Ended		3 Months Ended		1 Months Ended		3 Months Ended
	Mar. 31, 2015	Jun. 30, 2014	Mar. 31, 2015 Cash flow hedge USD ($)	Mar. 31, 2014 Cash flow hedge USD ($)	Mar. 31, 2015 Cash flow hedge Foreign currency forward/option contracts USD ($)	Mar. 31, 2014 Cash flow hedge Foreign currency forward/option contracts USD ($)	Mar. 31, 2015 Cash flow hedge Foreign currency forward/option contracts Cost of Sales USD ($)	Mar. 31, 2014 Cash flow hedge Foreign currency forward/option contracts Cost of Sales USD ($)	Mar. 31, 2015 Cash flow hedge Commodity price swap contracts USD ($)	Mar. 31, 2014 Cash flow hedge Commodity price swap contracts USD ($)	Mar. 31, 2015 Cash flow hedge Commodity price swap contracts Cost of Sales USD ($)	Mar. 31, 2014 Cash flow hedge Commodity price swap contracts Cost of Sales USD ($)	Nov. 30, 2014 Cash flow hedge Interest rate swap contracts USD ($)	Aug. 31, 2011 Cash flow hedge Interest rate swap contracts USD ($)	Mar. 31, 2015 Cash flow hedge Interest rate swap contracts USD ($)	Dec. 31, 2014 Cash flow hedge Interest rate swap contracts EUR (€)	Aug. 31, 2011 Cash flow hedge Interest rate swap contracts Fixed rate Medium term note due 2016 USD ($)	Nov. 30, 2014 Cash flow hedge Interest rate swap contracts Fixed rate Euro Medium term note due 2026 EUR (€)	Mar. 31, 2015 Cash flow hedge Interest rate swap contracts Interest expense USD ($)
Derivatives in Cash Flow Hedging Relationships
Maximum length of time hedged in cash flow hedge	36 months
Maximum length of time hedged in cash flow hedge prior to current period	24 months	12 months
Derivative notional amount					$ 2,800									$ 400		€ 500
Principal amount																	1,000	750
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Effective portion of Derivative			136	9	136	7			0	2			(8)	(7)	0
Gain (Loss) on Hedged Item Recognized in Income			27	6			30	4			(2)	2							(1)
Accumulated other comprehensive income (loss), unrealized gain (loss) on cash flow hedges			169										(5)	(4)	(6)
Ineffective portion of gain (loss) on derivative and amount excluded from effectiveness testing recognized in income			0	0			0	0			0	0							0
Term of debt instrument																	5 years	12 years
Term of derivative contract													12 years	5 years
After-tax net unrealized gain (loss) anticipated to be reclassifed from AOCI to the income statement within next twelve months			116
After-tax net unrealized gain (loss) anticipated to be reclassifed from AOCI to the Income Statement over remaining fiscal year			91
After-tax net unrealized gain (loss) anticipated to be reclassifed from AOCI to the Income Statement over next fiscal year			$ 70