Environmental (Schedule of Environmental Remediation Reserves) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Environmental Remediation Obligations [Abstract]
Demerger obligations (Note 24)	$ 22	$ 25
Divestiture obligations (Note 24)	17	21
Active sites	18	23
US Superfund sites	13	12
Other environmental remediation reserves	2	3
Total	$ 72	$ 84