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Segment Information - Revenues by Product Line (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Revenue from External Customer [Line Items] |  |  |
Sales and other operating revenues | [1] | $ 18,694 | $ 16,134
Refined products |  |  |
Revenue from External Customer [Line Items] |  |  |
Sales and other operating revenues |  | 16,158 | 13,876
Merchandise |  |  |
Revenue from External Customer [Line Items] |  |  |
Sales and other operating revenues |  | 1,130 | 1,192
Crude oil and refinery feedstocks |  |  |
Revenue from External Customer [Line Items] |  |  |
Sales and other operating revenues |  | 883 | 687
Service, transportation and other |  |  |
Revenue from External Customer [Line Items] |  |  |
Sales and other operating revenues |  | $ 523 | $ 379
[1] | The 2018 period reflects an election to present certain taxes on a net basis. See Notes 2 and 3 for further information.

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