Derivative Instruments (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Realized and Unrealized Before-Tax Gain / Loss on Derivative Instruments Recognized in the Consolidated Statement of Income | |||
| Sales and other operating revenue | $ 255,583 | $ 279,332 | $ 237,162 |
| Crude oil and product purchases | 143,801 | 156,172 | 128,217 |
| Not Designated As Hedging Instrument Trading [Member] | |||
| Realized and Unrealized Before-Tax Gain / Loss on Derivative Instruments Recognized in the Consolidated Statement of Income | |||
| Sales and other operating revenue | (412) | 130 | 6 |
| Crude oil and product purchases | 179 | (120) | (105) |
| Total | $ (233) | $ 10 | $ (99) |