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Capitalized Exploratory Well Costs and Undeveloped Leasehold Costs (Tables)
 3 Months Ended
Mar. 31, 2020
Extractive Industries [Abstract]  
Aging of Capitalized Well Costs The following table provides an aging of capitalized exploratory well costs based on the date that drilling commenced:
(millions, except number of projects)
March 31,
2020
 
December 31,
2019
Exploratory Well Costs Capitalized for a Period of One Year or Less
$
30

 
$
22

Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling
261

 
258

Capitalized Exploratory Well Costs, End of Period
$
291

 
$
280

Number of Projects with Exploratory Well Costs That Have Been Capitalized for a Period Greater Than One Year Since Commencement of Drilling
5

 
5
Rollforward of Undeveloped Lease Costs Changes in undeveloped leasehold costs are as follows:
(millions)
Three Months Ended March 31, 2020
Undeveloped Leasehold Costs, Beginning of Period
$
2,152

Additions to Undeveloped Leasehold Costs
2

Impairment (1)
(1,485
)
Other
(2
)
Undeveloped Leasehold Costs, End of Period
$
667


(1) 
Relates to impairments of undeveloped leasehold costs for unproved properties in the Delaware Basin and Eagle Ford Shale. See Note 2. Basis of Presentation and Note 4. Impairments.