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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) | $ (635) | $ (81) | $ (1,100) | $ (258)
Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance at beginning of period | 377 | 238 | 226 | 263
Total increase (decrease) in unrealized losses included in cost of products sold | 630 | 79 | 1,086 | 252
Purchases | 20 | 26 | 28 | 41
Sales | (7) | (4) | (32) | (16)
Settlements | (188) | (167) | (521) | (354)
Transfers into Level 3 | 24 | 13 | 79 | 37
Transfers out of Level 3 | (21) | (4) | (31) | (42)
Balance at end of period | 835 | 181 | 835 | 181
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 | 0 |  | 0 |
Total increase (decrease) in unrealized losses included in cost of products sold | 15 |  | 15 |
Purchases | 17 |  | 17 |
Balance at end of period | 32 |  | 32 |
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 | 14 | 22 | 27 | 18
Total increase (decrease) in unrealized losses included in cost of products sold | (3) | (3) | 1 | (2)
Purchases | 3 | 26 | 11 | 41
Sales | (7) | (4) | (32) | (16)
Settlements | 0 | 0 | 0 | 0
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0 | 0
Balance at end of period | 7 | 41 | 7 | 41
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 | 363 | 216 | 199 | 245
Total increase (decrease) in unrealized losses included in cost of products sold | 618 | 82 | 1,070 | 254
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | (188) | (167) | (521) | (354)
Transfers into Level 3 | 24 | 13 | 79 | 37
Transfers out of Level 3 | (21) | (4) | (31) | (42)
Balance at end of period | $ 796 | $ 140 | $ 796 | $ 140

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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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