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Revenues and Accounts Receivable - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Minimum Volume Commitments [Line Items] |  |
Contract liability | $ 318 | $ 338
Minimum Volume Commitments |  |
Minimum Volume Commitments [Line Items] |  |
Counterparty deficiencies | 54 | 62
Contract liability | 35 | 40
Counterparty deficiencies unbilled and uncollected | 19 | $ 22
Crude Oil Sales Agreements Entered Into In Conjunction With Storage Arrangements And Future Inventory Exchanges |  |
Minimum Volume Commitments [Line Items] |  |
Contract liability | $ 130 |

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