Environmental (Schedule of Environmental Remediation Reserves) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Environmental Remediation Obligations [Abstract]
Demerger obligations (Note 16)	$ 28	$ 23
Divestiture obligations (Note 16)	11	12
Active sites	12	13
US Superfund sites	11	11
Other environmental remediation liabilities	2	2
Total	$ 64	$ 61

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

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