Environmental (Schedule of Environmental Remediation Reserves) (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Environmental Remediation Obligations [Abstract]
Demerger obligations (Note 16)	$ 22	$ 25
Divestiture obligations (Note 16)	18	21
Active sites	20	23
US Superfund sites	14	12
Other environmental remediation reserves	2	3
Total	$ 76	$ 84