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Sales and Other Operating Revenues (Narrative) (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Accounts receivable | $ 3,237 | $ 6,902
Receivables from contracts with customers | 376 | 336
Contract with customer, liability | 0 | $ 0
Minimum Volume Commitment Contracts |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Remaining performance obligations | $ 0 |
Minimum |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Customer contracts, term | 5 years |
Maximum |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Customer contracts, term | 15 years |

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- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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