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Summarized Financial Data – Chevron Phillips Chemical Company LLC - Summary of Balance Sheet Information (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Subsidiary Statements Captions [Line Items]
Current assets	$ 28,329	$ 34,021
Current liabilities	26,530	27,171
Total CTC net deficit	145,208	155,642	$ 149,319	$ 146,722
Chevron Phillips Chemical Company LLC
Subsidiary Statements Captions [Line Items]
Current assets	2,554	2,820
Other assets	14,314	13,790
Current liabilities	1,247	1,281
Other liabilities	3,174	2,892
Total CTC net deficit	$ 12,447	$ 12,437

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