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Property, Plant and Equipment Classes and Depreciation (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Public Utilities, Property, Plant and Equipment, Transmission and Distribution [Abstract] |  |  |
Accumulated depreciation, depletion and amortization | $ (14,175) | $ (12,306) |
Public Utilities, Property, Plant and Equipment, Equipment | 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 |
Public Utilities, Property, Plant and Equipment, Common | 14,055 | 12,900 |
Depreciation, depletion and amortization | 2,261 | 2,209 | $ 2,309
Charged against PPE [Member] |  |  |
Public Utilities, Property, Plant and Equipment, Transmission and Distribution [Abstract] |  |  |
Depreciation, depletion and amortization | 2,022 | 1,970 | $ 2,059
Gas Transmission Equipment [Member] |  |  |
Public Utilities, Property, Plant and Equipment, Transmission and Distribution [Abstract] |  |  |
Pipelines (Natural gas, liquids, crude oil and CO2) | 20,157 | 19,341 |
Gas, Transmission and Distribution Equipment [Member] |  |  |
Public Utilities, Property, Plant and Equipment, Transmission and Distribution [Abstract] |  |  |
Equipment (Natural gas, liquids, crude oil, CO2, and terminals) | 24,152 | 23,298 |
Property, Plant and Equipment, Other Types [Member] |  |  |
Public Utilities, Property, Plant and Equipment, Transmission and Distribution [Abstract] |  |  |
Other(a) | $ 5,570 | $ 4,780 |

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Period end book value of accumulated depreciation on property, plant and equipment (PPE) that is owned by the regulated operations of the public utility. + References No definition available. + Details
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- Definition Period end amount of property, plant and equipment (PPE) related to regulated assets common to business units. + References No definition available. + Details
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- Definition Period end amount of construction work in progress in public utility. + References No definition available. + Details
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- Definition Period end book value of land owned by the public utility. + References No definition available. + Details
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- Definition Period end amount of total net PPE. + References No definition available. + Details
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- Definition Period end book value of other property, plant and equipment (PPE) owned (but not classified elsewhere) by the public utility. + References No definition available. + Details
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