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Reportable Segments (Advances to and investments in affiliates) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |
Investments in unconsolidated affiliates | $ 3,097 | $ 2,893 | $ 2,947
Intrastate Transportation and Storage |  |  |
Segment Reporting Information [Line Items] |  |  |
Investments in unconsolidated affiliates | 144 | 139 | 110
Interstate Transportation and Storage |  |  |
Segment Reporting Information [Line Items] |  |  |
Investments in unconsolidated affiliates | 2,179 | 2,201 | 2,209
Midstream |  |  |
Segment Reporting Information [Line Items] |  |  |
Investments in unconsolidated affiliates | 141 | 54 | 101
NGL and Refined Products Transportation and Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Investments in unconsolidated affiliates | 390 | 398 | 457
Crude Oil Transportation and Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Investments in unconsolidated affiliates | 187 | 48 | 19
All Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Investments in unconsolidated affiliates | $ 56 | $ 53 | $ 51

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- Definition Amount of investment in equity method investee and investment in and advance to affiliate. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(18)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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