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Supplemental Information on Oil and Gas Operations (Unaudited) (Costs Incurred) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property acquisition costs:
Proved properties			$ 2
Unproved properties	$ 8	$ 35	70
Exploration costs	159	312	679
Development costs	820	1,499	1,505
Costs incurred	$ 987	$ 1,846	$ 2,256

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Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have proved reserves.

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Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have unproved reserves.

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Development costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.

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Exploration costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.

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Amount of costs incurred related to oil and gas property acquisition, exploration and development activities, including capitalized costs and costs charged to expense.

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