Current Other Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Other Liabilities, Current [Abstract]
Asset retirement obligations	$ 11	$ 10
Benefit obligations (Note 9)	27	27
Customer rebates	52	53
Derivatives (Note 14)	70	87
Environmental (Note 10)	13	11
Insurance	5	5
Interest	26	29
Legal (Note 16)	19	107
Operating leases	35	36
Restructuring (Note 12)	10	11
Salaries and benefits	113	121
Sales and use tax/foreign withholding tax payable	105	140
Other	45	43
Total	$ 531	$ 680