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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2017
Income Tax
Income tax expense (benefit)	$ 3	$ 8	$ 3	$ 0
Noncurrent payable to affiliates	30		30		$ 30
US Tax Authority
Income Tax
Deferred tax asset due to basis step up						$ 36
Net deferred tax asset	$ 24		$ 24		$ 25
Huntsman \| SK Capital
Income Tax
Number of shares sold			42,500,000