Acquisitions and Divestitures - Acquisitions (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2016	Mar. 31, 2017
Business Acquisitions Information
Purchase price paid for business combinations (net of cash acquired)	$ 4
Supplemental information:
Cash paid, net of cash acquired	$ 4
Scott Safety
Supplemental information:
Estimated purchase price to acquire business			$ 2,000
Annual sales prior to acquisition		$ 570