Derivative and Financial Instruments (Commodity - Income Statement Location - Gain (Loss) Amounts of Derivatives) (Details) - Commodity Contract [Member] - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Sales and other operating revenues [Member] | |||
| Derivative Instruments, Gain (Loss) [Line Items] | |||
| Gains (losses) from commodity derivatives | $ (228,000,000) | $ 19,000,000 | $ 141,000,000 |
| Other Income (Loss) [Member] | |||
| Derivative Instruments, Gain (Loss) [Line Items] | |||
| Gains (losses) from commodity derivatives | 25,000,000 | 4,000,000 | 4,000,000 |
| Purchased commodities [Member] | |||
| Derivative Instruments, Gain (Loss) [Line Items] | |||
| Gains (losses) from commodity derivatives | $ 75,000,000 | $ 11,000,000 | $ (118,000,000) |