Supplemental Equity and Comprehensive Income Information (Details 5) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Supplemental Equity and Comprehensive Income Information
Net income attributable to 3M	$ 1,300	$ 1,267	$ 2,499	$ 2,474