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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2019
Oil and Gas Exploration and Production Industries Disclosures [Abstract]  
Capitalized costs related to proved and unproved oil and natural gas properties by area
Our capitalized costs related to proved oil and natural gas properties by area for the periods ended December 31 were as follows:
 
2019
 
2018
 
(in millions)
Proved
 
 
 
Eagle Ford
$
4,266

 
$
3,898

Northeastern Utah
1,331

 
1,659

Permian
1,791

 
1,787

Total Proved
7,388

 
7,344

Less accumulated depletion
(3,990
)
 
(3,607
)
Net capitalized costs for oil and natural gas properties
$
3,398

 
$
3,737
Changes in net asset retirement liability
The net asset retirement liability as of December 31 on our consolidated balance sheet in other current and non-current liabilities and the changes in the net liability for the periods ended December 31 were as follows:
 
2019
 
2018
 
(in millions)
Net asset retirement liability at January 1
$
42

 
$
35

Liabilities incurred
1

 
1

Liabilities settled
(1
)
 
—

Accretion expense
3

 
3

Changes in estimate
—

 
3

Net asset retirement liability at December 31
$
45

 
$
42