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Related Party Transactions - Expenses from Related Parties (Details) - USD ($) $ in Millions |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 26, 2020 | Mar. 09, 2020 | Nov. 11, 2019 | Aug. 12, 2019 | May 13, 2019 | Mar. 11, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of materials and other |  |  |  |  |  |  | $ 846 | $ 1,221 | $ 2,348 | $ 3,589 |
Dividends | $ 40 | $ 80 | $ 80 | $ 75 | $ 75 | $ 75 |  |  | 121 | 225 | $ 307
Enable | Joint Venture Transportation Agreement |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of materials and other |  |  |  |  |  |  | 3 | 3 | 9 | 8 |
IEP |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends | $ 28 | $ 57 | $ 57 | $ 53 | $ 53 | $ 53 | $ 0 | $ 53 | $ 85 | $ 159 | $ 217

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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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