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Derivatives and Financial Instruments (Summary of Gains/(Losses) From Commodity Derivatives) (Details) - Commodity Derivatives - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net gain (loss) from commodity derivative activity | $ (298) | $ 71 | $ 825 | $ (248)
Sales and other operating revenues |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net gain (loss) from commodity derivative activity | (180) | 17 | 499 | (160)
Other income |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net gain (loss) from commodity derivative activity | 6 | 0 | 9 | 13
Purchased crude oil and products |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net gain (loss) from commodity derivative activity | $ (124) | $ 54 | $ 317 | $ (101)

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