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Environmental (Tables)
 9 Months Ended
Sep. 30, 2020
Environmental Remediation Obligations [Abstract]  
Schedule of Environmental Remediation Reserves
The components of environmental remediation liabilities are as follows:
As of
September 30,
2020		As of
December 31,
2019
(In $ millions)
Demerger obligations (Note 16)
29 23 
Divestiture obligations (Note 16)
14 12 
Active sites12 13 
US Superfund sites12 11 
Other environmental remediation liabilities2 2 
Total69 61