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Property, Plant and Equipment (Notes)
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Disclosure [Text Block]
Property, Plant and Equipment, net
 
Classes and Depreciation
 
As of December 31, 2017 and 2016, our property, plant and equipment, net consisted of the following (in millions):
 
December 31,
 
2017
 
2016
Pipelines (Natural gas, liquids, crude oil and CO2)
$
20,157

 
$
19,341

Equipment (Natural gas, liquids, crude oil, CO2, and terminals)
24,152

 
23,298

Other(a)
5,570

 
4,780

Accumulated depreciation, depletion and amortization
(14,175
)
 
(12,306
)
 
35,704

 
35,113

Land and land rights-of-way
1,456

 
1,431

Construction work in process
2,995

 
2,161

Property, plant and equipment, net
$
40,155

 
$
38,705


_______
(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, 2017 and 2016, property, plant and equipment, net included $14,055 million and $12,900 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 $2,022 million, $1,970 million, and $2,059 million for the years ended December 31, 2017, 2016, and 2015, respectively.

Asset Retirement Obligations
 
As of December 31, 2017 and 2016, we recognized asset retirement obligations in the aggregate amount of $208 million and $193 million, respectively, of which $4 million and $9 million, respectively, were classified as current. 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.