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Summarized Financial Data - Chevron Phillips Chemical Company LLC (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Summarized Financial Data - Chevron Transport Corporation |  |  |
Costs and other deductions | $ 27,356 | $ 31,243 |
Net income attributable to TCO | $ 3,599 | $ 2,649 |
Chevron Phillips Chemical Company LLC |  |  |
Affiliate Statements Captions [Line Items] |  |  |
Percentage of affiliate by summarized financial information | 100.00% |  |
Summarized Financial Data - Chevron Transport Corporation |  |  |
Costs and other deductions | $ 1,812 |  | $ 2,004
Net income attributable to TCO | 337 |  | 449
Chevron Phillips Chemical Company LLC | Oil and Gas |  |  |
Summarized Financial Data - Chevron Transport Corporation |  |  |
Total Revenues and Other Income | $ 2,195 |  | $ 2,377
Chevron Phillips Chemical Company LLC |  |  |
Affiliate Statements Captions [Line Items] |  |  |
Equity method investment, ownership percentage | 50.00% |  |

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