Operating Revenue - Segment Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Operating revenue	$ 3,613	$ 3,615	$ 11,188	$ 10,685
Automotive OEM
Disaggregation of Revenue [Line Items]
Segment revenue	781	795	2,561	2,443
Food Equipment
Disaggregation of Revenue [Line Items]
Segment revenue	567	549	1,647	1,575
Test & Measurement and Electronics
Disaggregation of Revenue [Line Items]
Segment revenue	536	525	1,633	1,524
Welding
Disaggregation of Revenue [Line Items]
Segment revenue	414	378	1,277	1,150
Polymers & Fluids
Disaggregation of Revenue [Line Items]
Segment revenue	415	434	1,302	1,297
Construction Products
Disaggregation of Revenue [Line Items]
Segment revenue	431	440	1,303	1,260
Specialty Products
Disaggregation of Revenue [Line Items]
Segment revenue	475	498	1,482	1,451
Intersegment revenue
Disaggregation of Revenue [Line Items]
Segment revenue	$ (6)	$ (4)	$ (17)	$ (15)