Financial Instruments And Derivatives (Narrative) (Details) bbl in Millions, MMBTU in Millions, $ in Millions |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2019
USD ($)
MMBTU
bbl
|
Dec. 31, 2018
USD ($)
bbl
|
Dec. 31, 2017
USD ($)
|
|
| Additions to long-term debt | $ | $ 7,052 | $ 46 | $ 60 |
| Exxon Mobil Corporation [Member] | |||
| Additions to long-term debt | $ | $ 7,000 | ||
| Crude Oil [Member] | Long [Member] | |||
| Net notional long / short position of derivative instruments bbl | 57 | ||
| Crude Oil [Member] | Short [Member] | |||
| Net notional long / short position of derivative instruments bbl | 19 | ||
| Products [Member] | Short [Member] | |||
| Net notional long / short position of derivative instruments bbl | 38 | 9 | |
| Natural Gas [Member] | Short [Member] | |||
| Net notional long / short position of derivative instruments MMBtus | MMBTU | 165 | ||