Property, Plant and Equipment (Notes)

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment Disclosure [Text Block]

Property, Plant and Equipment, net

Classes and Depreciation

As of December 31, 2019 and 2018, our property, plant and equipment, net consisted of the following (in millions):

	December 31,
	2019			2018
Pipelines (Natural gas, liquids, crude oil and CO2)	$	19,856		$	19,727
Equipment (Natural gas, liquids, crude oil, CO2, and terminals)	25,791			24,392
Other(a)	5,360			5,447
Accumulated depreciation, depletion and amortization	(16,950		)	(15,359		)
	34,057			34,207
Land and land rights-of-way	1,356			1,378
Construction work in process	1,006			2,312
Property, plant and equipment, net	$	36,419		$	37,897

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(a) Includes general plant, general structures and buildings, computer and communication equipment, intangibles, vessels, transmix products, linefill and miscellaneous property, plant and equipment.

As of December 31, 2019 and 2018, property, plant and equipment, net included $12,229 million and $12,349 million, respectively, of assets which were regulated by either the FERC or, prior to the sales of TMPL and KML, by the NEB. Depreciation, depletion, and amortization expense charged against property, plant and equipment was $2,176 million, $2,057 million, and $2,022 million for the years ended December 31, 2019, 2018, and 2017, respectively.

Asset Retirement Obligations

As of December 31, 2019 and 2018, we recognized asset retirement obligations in the aggregate amount of $218 million and $213 million, respectively, of which $4 million were classified as current for both periods. The majority of our asset retirement obligations are associated with our CO2 business segment, where we are required to plug and abandon oil and gas wells that have been removed from service and to remove the surface wellhead equipment and compressors.