Accounting For Suspended Exploratory Well Costs (Change In Capitalized Suspended Exploratory Well Costs) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Accounting For Suspended Exploratory Well Costs [Abstract] | |||
| Capitalized suspended exploratory well costs, beginning balance | $ 3,587 | $ 2,707 | $ 2,679 |
| Additions pending the determination of proved reserves | 847 | 1,095 | 293 |
| Charged to expense | (5) | (28) | (52) |
| Reclassifications to wells, facilities and equipment based on the determination of proved reserves | (43) | (160) | (107) |
| Divestments/Other | (14) | (27) | (106) |
| Capitalized suspended exploratory well costs, ending balance | 4,372 | 3,587 | 2,707 |
| Ending balance attributed to equity companies included above | $ 696 | $ 645 | $ 13 |