Variable Interest Entity - Additional Information (Details)	3 Months Ended
Mar. 31, 2019 kt
KFPC \| Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Variable interest entity, ownership percentage	50.00%
Minimum purchase commitment of plant production (as a percent)	80.00%
Joint venture \| Taiwan \| Formosa Petrochemical Corporation
Variable Interest Entity [Line Items]
Capacity of HSBC plant	30

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=77990344&loc=SL6759159-111685

Name:	us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration