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Property, Plant and Equipment (Notes) | 12 Months Ended
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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 CO 2) | $ | 20,157 |  |  | $ | 19,341 |
Equipment (Natural gas, liquids, crude oil, CO 2, 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 CO 2 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.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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