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Property, Plant and Equipment (Notes)
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Disclosure [Text Block]
Property, Plant and Equipment, net
 
Classes and Depreciation
 
As of December 31, 2018 and 2017, our property, plant and equipment, net consisted of the following (in millions):
 
December 31,
 
2018
 
2017
Pipelines (Natural gas, liquids, crude oil and CO2)
$
19,727

 
$
20,157

Equipment (Natural gas, liquids, crude oil, CO2, and terminals)
24,392

 
24,152

Other(a)
5,447

 
5,570

Accumulated depreciation, depletion and amortization
(15,359
)
 
(14,175
)
 
34,207

 
35,704

Land and land rights-of-way
1,378

 
1,456

Construction work in process
2,312

 
2,995

Property, plant and equipment, net
$
37,897

 
$
40,155


_______
(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, 2018 and 2017, property, plant and equipment, net included $12,349 million and $14,055 million, respectively, of assets which were regulated by either the FERC or the NEB. Depreciation, depletion, and amortization expense charged against property, plant and equipment was $2,057 million, $2,022 million, and $1,970 million for the years ended December 31, 2018, 2017, and 2016, respectively.

Asset Retirement Obligations
 
As of December 31, 2018 and 2017, we recognized asset retirement obligations in the aggregate amount of $213 million and $208 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.