Goodwill and Intangible Assets (Goodwill balance by business segment) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Mar. 31, 2018	Sep. 30, 2018
Goodwill
Balance at the beginning of the period	$ 10,513	$ 10,513
Acquisition activity		7
Divestiture activity		(259)
Translation and other		(138)
Balance at the end of the period		10,123
Amount of Goodwill impairment	0
Industrial
Goodwill
Balance at the beginning of the period	2,678	2,678
Divestiture activity		(4)
Translation and other		(50)
Balance at the end of the period		2,624
Safety And Graphics
Goodwill
Balance at the beginning of the period	4,419	4,419
Acquisition activity		7
Divestiture activity		(8)
Translation and other		(53)
Balance at the end of the period		4,365
Health Care
Goodwill
Balance at the beginning of the period	1,682	1,682
Translation and other		(20)
Balance at the end of the period		1,662
Electronics And Energy
Goodwill
Balance at the beginning of the period	1,524	1,524
Divestiture activity		(247)
Translation and other		(11)
Balance at the end of the period		1,266
Consumer
Goodwill
Balance at the beginning of the period	$ 210	210
Translation and other		(4)
Balance at the end of the period		$ 206