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Property, Plant, and Equipment and Intangible Assets
12 Months Ended
Dec. 31, 2023
Property, Plant and Equipment [Abstract]  
Property, Plant, and Equipment and Intangible Assets PROPERTY, PLANT, AND EQUIPMENT AND INTANGIBLE ASSETS
Property, Plant, and Equipment
The following is a summary of Property, plant, and equipment by classification:
Average Estimated Useful Life
December 31,
20232022
(years)(millions)
Property, plant, and equipment
Land and other non-depreciable assetsN/A$96 $97 
Rights of way and easements
25 to 40
103 103 
Pipelines and interconnects
25 to 40
3,460 2,845 
Facilities and processing plants
7 to 40
1,234 998 
Wells and well equipment
40 to 70
70 70 
General plant
3 to 40
40 32 
Construction in progressN/A279 389 
Total Property, plant, and equipment$5,282 $4,534 
Less accumulated depreciation(848)(728)
Net Property, plant, and equipment$4,434 $3,806 
Intangible Assets
The following is a summary of Intangible Assets by classification:
December 31, 2023December 31, 2022
Useful Lives
Gross Carrying Value
Accumulated Amortization
Net Carrying Value
Gross Carrying Value
Accumulated Amortization
Net Carrying Value
(millions)
Intangible assets subject to amortization
Customer relationships
25 - 40 years (a)
$2,252 $(289)$1,963 $2,252 $(233)$2,019 
Contract intangibles
14 - 26 years
18 (13)5 18 (12)
Total $2,270 $(302)$1,968 $2,270 $(245)$2,025 
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(a) The useful lives of the customer relationship intangible assets are based on the number of years in which the assets are expected to economically contribute to the business. The expected economic benefit incorporates existing customer contracts and expected renewal rates based on the estimated volume and production lives of natural gas resources in each region.
The following table summarizes estimated customer relationships and contract intangibles amortization expense to be recognized during each year through 2028:
20242025202620272028
(millions)
Estimated amortization expense$57 $57 $57 $57 $57 
Depreciation and Amortization
The following is a summary of depreciation and amortization expense by asset type:
Year Ended December 31,
202320222021
(millions)
Property, plant, and equipment$125 $113 $108 
Customer relationships and other intangible assets, net57 57 58 
Total Depreciation and amortization$182 $170 $166