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Accounting for Suspended Exploratory Wells - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) Well Project	Dec. 31, 2017 USD ($) Project	Dec. 31, 2016 USD ($) Project
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Capitalized exploratory well costs that have been capitalized for period greater than one year | $	$ 3,361	$ 3,395	$ 3,095
Number of projects with exploratory well costs that have been capitalized for a period greater than one year (in projects) | Project	30	32	35
Expected period for decision on the recognition of proved reserves	5 years
Capitalized exploratory well costs that have been capitalized for period greater than one year, number of wells | Well	153
Drilling Activity
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Capitalized exploratory well costs that have been capitalized for period greater than one year | $	$ 1,585
Number of projects with exploratory well costs that have been capitalized for a period greater than one year (in projects) | Project	14
No Drilling Activity
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Capitalized exploratory well costs that have been capitalized for period greater than one year | $	$ 1,776
Number of projects with exploratory well costs that have been capitalized for a period greater than one year (in projects) | Project	16
Undergoing Front End Engineering and Design with Final Investment Decision Expected
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Capitalized exploratory well costs that have been capitalized for period greater than one year | $	$ 672
Number of projects with exploratory well costs that have been capitalized for a period greater than one year (in projects) | Project	3
Undergoing front-end engineering and design with final investment decision expected in three years	4 years
Development Concept Under Review by Government
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Capitalized exploratory well costs that have been capitalized for period greater than one year | $	$ 93
Number of projects with exploratory well costs that have been capitalized for a period greater than one year (in projects) | Project	1
Reviewing Development Alternatives
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Capitalized exploratory well costs that have been capitalized for period greater than one year | $	$ 963
Number of projects with exploratory well costs that have been capitalized for a period greater than one year (in projects) | Project	8
Miscellaneous Activities for Projects with Smaller Amounts Suspended
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Capitalized exploratory well costs that have been capitalized for period greater than one year | $	$ 48
Number of projects with exploratory well costs that have been capitalized for a period greater than one year (in projects) | Project	4

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The amount of exploratory well costs that have been capitalized for a period of greater than one year after the completion of drilling.

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