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Capitalized Exploratory Well Costs and Undeveloped Leasehold Costs (Tables)
 6 Months Ended
Jun. 30, 2019
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)
June 30,
2019
 
December 31,
2018
Exploratory Well Costs Capitalized for a Period of One Year or Less
$
11

 
$
6

Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling
351

 
348

Capitalized Exploratory Well Costs, End of Period
$
362

 
$
354

Number of Projects with Exploratory Well Costs That Have Been Capitalized for a Period Greater Than One Year Since Commencement of Drilling
7

 
7
Rollforward of Undeveloped Lease Costs
Changes in undeveloped leasehold costs were as follows:
(millions)
Six Months Ended June 30, 2019
Undeveloped Leasehold Costs, Beginning of Period
$
2,306

Additions to Undeveloped Leasehold Costs
50

Transfers to Proved Properties
(11
)
Assets Sold
(2
)
Undeveloped Leasehold Costs, End of Period
$
2,343