Changes in the Group structure - Major business combinations, Marathon Oil Libya Limited (Details) - Marathon Oil Libya Limited $ in Millions	Mar. 01, 2018 USD ($)
Major business combinations
Acquisition cost	$ 451
Purchase price allocation
Intangible assets	485
Tangible assets	11
Other assets and liabilities	(69)
Net debt	24
Fair value of consideration transferred	$ 451
Waha Concessions
Major business combinations
Percentage of acquired entity's interest in joint operation	16.33%

The fair value, at acquisition date, of the consideration transferred in a business combination. [Refer: Business combinations [member]]

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The amount recognised as of the acquisition date for borrowings assumed in a business combination. [Refer: Borrowings; Business combinations [member]]

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The amount recognised as of the acquisition date for net identifiable assets acquired or liabilities assumed in a business combination. [Refer: Business combinations [member]]

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The amount recognised as of the acquisition date for identifiable intangible assets acquired in a business combination. [Refer: Intangible assets other than goodwill; Business combinations [member]]

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The amount recognised as of the acquisition date for plant, property and equipment acquired in a business combination. [Refer: Property, plant and equipment; Business combinations [member]]

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The interest in the joint operation held by the entity acquired in a business combination.

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The amount recognised as of the acquisition date for net other assets and liabilities acquired in a business combination.

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