Environmental (Schedule of Environmental Remediation Reserves) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Environmental Remediation Obligations [Abstract]
Demerger obligations (Note 24)	$ 26	$ 28
Divestiture obligations (Note 24)	16	17
Active sites	14	15
US Superfund sites	11	11
Other environmental remediation reserves	2	2
Total	$ 69	$ 73

Total costs accrued as of the balance sheet date for environmental loss contingencies.

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