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Related Party Transactions - Expenses from Related Parties (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 26, 2020 | Mar. 09, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Related Party Transaction [Line Items] |  |  |  |  |
Cost of materials and other |  |  | $ 1,369 | $ 1,058 |
Dividends | $ 40 | $ 80 | 0 | 80 | $ 121
Enable | Joint Venture Transportation Agreement |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Cost of materials and other |  |  | 3 | 3 |
IEP |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Dividends | $ 28 | $ 57 | $ 0 | $ 57 | $ 85

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