Derivative and Financial Instruments - Commodity GainLoss (Details 1) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
|
| Sales and other operating revenues [Member] | ||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Gains (losses) from commodity derivatives | $ 51 | $ (3) |
| Other Income [Member] | ||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Gains (losses) from commodity derivatives | 1 | 1 |
| Purchased commodities [Member] | ||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Gains (losses) from commodity derivatives | $ (38) | $ (1) |