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Revenues and Accounts Receivable - Counterparty Deficiencies (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Minimum Volume Commitments [Line Items] |  |
Counterparty deficiencies billed and collected | $ 139 | $ 501
Minimum Volume Commitments |  |
Minimum Volume Commitments [Line Items] |  |
Counterparty deficiencies billed and collected | 54 | 73
Counterparty deficiencies unbilled | 21 | 4
Counterparty deficiencies | $ 75 | $ 77

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