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Property, Plant and Equipment (Notes) | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment, net | 6. Property, Plant and Equipment, net Classes and Depreciation As of December 31, 2020 and 2019, our property, plant and equipment, net consisted of the following:
| December 31,
| 2020 |  | 2019
| (In millions)
Pipelines (Natural gas, liquids, crude oil and CO 2) | $ | 20,339 |  |  | $ | 19,856 |
Equipment (Natural gas, liquids, crude oil, CO 2, and terminals) | 26,142 |  |  | 25,791 |
Other(a) | 5,188 |  |  | 5,360 |
Accumulated depreciation, depletion and amortization | (17,818) |  |  | (16,950) |
| 33,851 |  |  | 34,057 |
Land and land rights-of-way | 1,403 |  |  | 1,356 |
Construction work in process | 582 |  |  | 1,006 |
Property, plant and equipment, net | $ | 35,836 |  |  | $ | 36,419 |
(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, 2020 and 2019, property, plant and equipment, net included $12,160 million and $12,229 million, respectively, of assets which were regulated by the FERC. Depreciation, depletion, and amortization expense charged against property, plant and equipment was $1,928 million, $2,176 million, and $2,057 million for the years ended December 31, 2020, 2019, and 2018, respectively. Asset Retirement Obligations As of December 31, 2020 and 2019, we recognized asset retirement obligations in the aggregate amount of $214 million and $218 million, respectively, of which $4 million were classified as current for both periods. 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 asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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