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Revenues and Accounts Receivable - Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) $ / bbl | Oct. 31, 2018 $ / bbl | Dec. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Contract With Customer, Asset And Liability [Line Items] |  |  |  |  |
Other current assets | $ 373 |  | $ 373 | $ 373 | $ 221
Contract liability, deferred revenue | $ 338 |  | $ 338 | 338 | 90
Decrease in NYMEX WTI oil price, percentage |  |  | 44.00% |  |
NYMEX WTI oil price (in dollars per barrel) | $ / bbl | 42.53 | 76.41 |  |  |
Advance cash payments received from third parties to mitigate credit risk | $ 140 |  | $ 140 | 140 | 117
Standby letters of credit | 117 |  | 117 | $ 117 | 54
Substantially all trade accounts receivable, net, maximum age of balances past their scheduled invoice date |  |  |  | 30 years |
Allowance for doubtful accounts receivable |  |  |  |  | 3
General payment terms |  |  |  | P30D |
Crude Oil Sales Agreements Entered Into In Conjunction WIth Storage Arrangements And Future Inventory Exchanges |  |  |  |  |
Contract With Customer, Asset And Liability [Line Items] |  |  |  |  |
Other current assets | 115 |  | 115 | $ 115 |
Contract liability, deferred revenue | 116 |  | 116 | 116 |
Minimum Volume Commitments |  |  |  |  |
Contract With Customer, Asset And Liability [Line Items] |  |  |  |  |
Counterparty deficiencies | 62 |  | 62 | 62 | 57
Contract liability, deferred revenue | 40 |  | 40 | 40 | 37
Counterparty deficiencies unbilled and uncollected | $ 22 |  | $ 22 | $ 22 | $ 20

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