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Related Party Transactions - Expenses from Related Parties (Details) - USD ($) $ in Millions |  |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 09, 2020 | Nov. 11, 2019 | Aug. 12, 2019 | May 13, 2019 | Mar. 11, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Cost of materials and other |  |  |  |  |  | $ 1,058 | $ 1,101 |
Dividends | $ 80 | $ 80 | $ 75 | $ 75 | $ 75 | 80 | 75 | $ 307
Enable | Joint Venture Transportation Agreement |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Cost of materials and other |  |  |  |  |  | 3 | 2 |
IEP |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Dividends | $ 57 | $ 57 | $ 53 | $ 53 | $ 53 | $ 57 | $ 54 | $ 217

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