Segment Information - Revenues by Product Line (Details) - USD ($) $ in Millions |
3 Months Ended | |||
|---|---|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
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| 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 | ||
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