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Summarized Financial Data - Chevron Phillips Chemical Company LLC (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Summarized Financial Data - Chevron Transport Corporation |  |
Sales and other operating revenues | $ 31,076 | $ 29,705
Costs and other deductions | 29,852 | 27,356
Net income attributable to equity method investee | 1,377 | 3,599
Oil and Gas |  |
Summarized Financial Data - Chevron Transport Corporation |  |
Sales and other operating revenues | $ 31,076 | 29,705
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 | $ 2,553 | 1,812
Net income attributable to equity method investee | 304 | 337
Chevron Phillips Chemical Company LLC | Oil and Gas |  |
Summarized Financial Data - Chevron Transport Corporation |  |
Sales and other operating revenues | $ 2,748 | $ 2,195
Chevron Phillips Chemical Company LLC |  |
Affiliate Statements Captions [Line Items] |  |
Equity method investment, ownership percentage | 50.00% |

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