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Related Party Transactions - Expenses Incurred and Payments Made to Related Parties (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
May 26, 2020 | Mar. 09, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Related Party Transaction [Line Items] |  |  |  |  |
Cost of materials and other |  |  | $ 3,373 | $ 4,851 | $ 5,683
Dividends | $ 40 | $ 80 | 121 | 306 | 238
Enable | Joint Venture Transportation Agreement |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Cost of materials and other |  |  | 11 | 12 | 8
IEP |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Dividends | $ 28 | $ 57 | 85 | 218 | 179
AEP | Tax Allocation Agreement |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Payments (received) made |  |  | $ 0 | $ (3) | $ 12

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