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Suspended Wells-Exploratory Capitalized Well Costs (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year |  | $ 814 | $ 711 | $ 786
2016 - 2018 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year |  | 265 |  |
2013 - 2015 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year |  | 374 |  |
2004 - 2012 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year |  | 175 |  |
Greater Poseidon-Australia [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [1],[2] | 177 |  |
Greater Poseidon-Australia [Member] | 2016 - 2018 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [1],[2] | 0 |  |
Greater Poseidon-Australia [Member] | 2013 - 2015 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [1],[2] | 157 |  |
Greater Poseidon-Australia [Member] | 2004 - 2012 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [1],[2] | 20 |  |
NPR-A-Alaska [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [3] | 149 |  |
NPR-A-Alaska [Member] | 2016 - 2018 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [3] | 111 |  |
NPR-A-Alaska [Member] | 2013 - 2015 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [3] | 38 |  |
NPR-A-Alaska [Member] | 2004 - 2012 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [3] | 0 |  |
Barossa/Caldita-Australia [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [1],[2] | 136 |  |
Barossa/Caldita-Australia [Member] | 2016 - 2018 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [1],[2] | 59 |  |
Barossa/Caldita-Australia [Member] | 2013 - 2015 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [1],[2] | 0 |  |
Barossa/Caldita-Australia [Member] | 2004 - 2012 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [1],[2] | 77 |  |
Surmont - Canada |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [3] | 118 |  |
Surmont - Canada | 2016 - 2018 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [3] | 6 |  |
Surmont - Canada | 2013 - 2015 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [3] | 55 |  |
Surmont - Canada | 2004 - 2012 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [3] | 57 |  |
Middle Magdalena Basin-Columbia |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [3] | 68 |  |
Middle Magdalena Basin-Columbia | 2016 - 2018 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [3] | 0 |  |
Middle Magdalena Basin-Columbia | 2013 - 2015 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [3] | 68 |  |
Middle Magdalena Basin-Columbia | 2004 - 2012 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [3] | 0 |  |
Narwhal Trend Alaska [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [3] | 52 |  |
Narwhal Trend Alaska [Member] | 2016 - 2018 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [3] | 52 |  |
Narwhal Trend Alaska [Member] | 2013 - 2015 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [3] | 0 |  |
Narwhal Trend Alaska [Member] | 2004 - 2012 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [3] | 0 |  |
Kamunsu East-Malaysia |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [1] | 19 |  |
Kamunsu East-Malaysia | 2016 - 2018 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [1] | 0 |  |
Kamunsu East-Malaysia | 2013 - 2015 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [1] | 19 |  |
Kamunsu East-Malaysia | 2004 - 2012 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [1] | 0 |  |
NC 98-Libya |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [1] | 15 |  |
NC 98-Libya | 2016 - 2018 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [1] | 0 |  |
NC 98-Libya | 2013 - 2015 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [1] | 11 |  |
NC 98-Libya | 2004 - 2012 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [1] | 4 |  |
WL4-00-Malaysia |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [1] | 17 |  |
WL4-00-Malaysia | 2016 - 2018 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [1] | 17 |  |
WL4-00-Malaysia | 2013 - 2015 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [1] | 0 |  |
WL4-00-Malaysia | 2004 - 2012 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [1] | 0 |  |
Other Projects [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [1],[3] | 63 |  |
Other Projects [Member] | 2016 - 2018 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [1],[3] | 20 |  |
Other Projects [Member] | 2013 - 2015 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [1],[3] | 26 |  |
Other Projects [Member] | 2004 - 2012 [Member] |  |  |  |
Aging of exploratory well costs that have been capitalized for more than one year |  |  |  |
Aging of Exploratory Well Cost that have been capitalized for more than one year | [1],[3] | $ 17 |  |
[1] | (2)Appraisal drilling complete; costs being incurred to assess development.
[2] | (3)Assets held for sale as of December 31, 2019.
[3] | (1)Additional appraisal wells planned.

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