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Revenues and Accounts Receivable - Counterparty Deficiencies (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Minimum Volume Commitments [Line Items] |  |
Counterparty deficiencies billed and collected | $ 494 | $ 501
Minimum Volume Commitments |  |
Minimum Volume Commitments [Line Items] |  |
Counterparty deficiencies billed and collected | 47 | 73
Counterparty deficiencies unbilled | 24 | 4
Counterparty deficiencies | $ 71 | $ 77

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