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Property, Plant and Equipment Classes and Depreciation (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Property, Plant and Equipment [Line Items] |  |  |
Accumulated depreciation, depletion and amortization | $ (17,818) | $ (16,950) |
Property, Plant and Equipment, Net, Excluding Nondepreciable Assets | 33,851 | 34,057 |
Property, plant and equipment, net | 35,836 | 36,419 |
Depreciation, Depletion and Amortization, Property, Plant and Equipment | 1,928 | 2,176 | $ 2,057
Pipelines |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Gross | 20,339 | 19,856 |
Equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Gross | 26,142 | 25,791 |
Other |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Gross | 5,188 | 5,360 |
Land and land rights-of-way |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Gross | 1,403 | 1,356 |
Construction work in process |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Gross | 582 | 1,006 |
Natural Gas Pipelines Regulated |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, net | $ 12,160 | $ 12,229 |

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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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