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Property, Plant and Equipment (Summary of Property, Plant and Equipment) (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | $ 16,454 | $ 14,462
Less accumulated depreciation | 3,163 | 2,275
Property, plant and equipment, net | 13,291 | 12,187
Natural gas gathering and NGL transportation pipelines and facilities |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 5,253 | 5,178
Processing, fractionation and storage facilities |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 4,729 | 3,893
Pipelines and related assets |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 2,388 | 2,253
Barges and towing vessels |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 553 | 490
Terminals and related assets |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 827 | 821
Refineries and related assets |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 839 | 0
Land, building, office equipment and other |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 873 | 770
Construction-in-progress |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | $ 992 | $ 1,057

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 + Details
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