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Reportable Segments (Advances to and investments in affiliates) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Property, Plant and Equipment, Additions | $ 5,630 | $ 6,006 | $ 5,929
Advances to and investments in unconsolidated affiliates | 2,642 | 2,705 | 3,040
Intrastate Transportation And Storage [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, Plant and Equipment, Additions | 344 | 175 | 76
Advances to and investments in unconsolidated affiliates | 83 | 85 | 387
Interstate Transportation and Storage [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, Plant and Equipment, Additions | 812 | 728 | 280
Advances to and investments in unconsolidated affiliates | 2,070 | 2,118 | 2,149
Midstream [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, Plant and Equipment, Additions | 1,161 | 1,308 | 1,255
Advances to and investments in unconsolidated affiliates | 124 | 126 | 111
NGL and refined products transportation and services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, Plant and Equipment, Additions | 2,381 | 2,971 | 2,198
Advances to and investments in unconsolidated affiliates | 243 | 234 | 235
Crude oil transportation and services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, Plant and Equipment, Additions | 474 | 453 | 1,841
Advances to and investments in unconsolidated affiliates | 28 | 22 | 18
Investment In Sunoco LP [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, Plant and Equipment, Additions | 103 | 103 | 119
Investment In USAC [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, Plant and Equipment, Additions | 205 | 0 | 0
Other Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, Plant and Equipment, Additions | 150 | 268 | 160
Advances to and investments in unconsolidated affiliates | $ 94 | $ 120 | $ 140

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- Definition Amount of investment in equity method investee and investment in and advance to affiliate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of acquisition of long-lived, 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, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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