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Fair Value Measurements (Reconciliation Of Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) | $ (383) | $ (210)
Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at beginning of period | 963 | 226
Total increase (decrease) in unrealized losses included in cost of products sold | 401 | 208
Purchases | 12 | 6
Sales | (2) | (16)
Settlements | (566) | (122)
Transfers into Level 3 | 65 | 36
Transfers out of Level 3 | (139) | (9)
Balance at end of period | 734 | 329
Significant Unobservable Inputs (Level 3) [Member] | Long-term Debt [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at beginning of period | 34 |
Total increase (decrease) in unrealized losses included in cost of products sold | 20 |
Purchases | 0 |
Balance at end of period | 54 |
Significant Unobservable Inputs (Level 3) [Member] | Inventory Related Payables [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at beginning of period | 11 | 27
Total increase (decrease) in unrealized losses included in cost of products sold | 0 | 3
Purchases | 12 | 6
Sales | (2) | (16)
Settlements | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Balance at end of period | 21 | 20
Significant Unobservable Inputs (Level 3) [Member] | Commodity Derivative Contracts Losses [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at beginning of period | 918 | 199
Total increase (decrease) in unrealized losses included in cost of products sold | 381 | 205
Purchases | 0 | 0
Sales | 0 | 0
Settlements | (566) | (122)
Transfers into Level 3 | 54 | 36
Transfers out of Level 3 | (139) | (9)
Balance at end of period | 648 | $ 309
Significant Unobservable Inputs (Level 3) [Member] | Foreign Exchange Contracts [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at beginning of period | 0 |
Total increase (decrease) in unrealized losses included in cost of products sold | 0 |
Purchases | 0 |
Sales | 0 |
Settlements | 0 |
Transfers into Level 3 | 11 |
Transfers out of Level 3 | 0 |
Balance at end of period | $ 11 |

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- Definition Amount of unrealized gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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