Suspended Wells (Tables) |
12 Months Ended |
|---|---|
Dec. 31, 2019 | |
| Suspended Wells [Abstract] | |
| Net changes in suspended exploratory well costs | Note 8—Suspended Wells and Other Exploration Expenses The following table reflects the net changes in suspended Millions of Dollars 2019 2018 2017 Beginning balance at January 1 $ 856 853 1,063 Additions pending the determination of proved reserves 239 140 118 Reclassifications to proved properties (11) (37) (66) Sales of suspended wells (54) (93) - Charged to dry hole expense (10) (7) (262) Ending balance at December 31 $ 1,020 * 856 853 |
| Aging of suspended well cost | The following table provides an aging of suspended Millions of Dollars 2019 2018 2017 Exploratory well costs capitalized for a period $ 206 145 67 Exploratory well costs capitalized for a period 814 711 786 Ending balance $ 1,020 * 856 853 Number of projects with exploratory well costs period greater than one year 23 24 23 |
| Aging of Exploratory Well Cost that have been capitalized for more than one year | The following table provides a further aging of than one year since the completion of drilling Millions of Dollars Suspended Since Total 2016–2018 2013–2015 2004–2012 Greater Poseidon—Australia (2)(3) 177 - 157 20 NPRA—Alaska (1) 149 111 38 - Barossa/Caldita—Australia (2)(3) 136 59 - 77 Surmont—Canada (1) 118 6 55 57 Middle Magdalena Basin—Colombia (1) 68 - 68 - Narwhal Trend—Alaska (1) 52 52 - - Kamunsu East—Malaysia (2) 19 - 19 - NC 98—Libya (2) 15 - 11 4 WL4-00—Malaysia (2) 17 17 - - Other of $10 million or less each (1)(2) 63 20 26 17 Total $ 814 265 374 175 (1)Additional appraisal wells planned. (2)Appraisal drilling complete; costs being incurred to assess development. (3)Assets held for sale as of December 31, 2019. |