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Fair Value Measurements (Reconciliation Of Assets Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | $ 422 | $ 280 | $ 804 | $ 491
Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance at beginning of period | 2,329 | 1,723 | 1,678 | 1,670
Total increase (decrease) in unrealized gains included in cost of products sold | 508 | 321 | 842 | 444
Purchases | 3,012 | 2,657 | 6,419 | 5,346
Sales | (3,625) | (2,958) | (7,135) | (5,782)
Settlements | (190) | (137) | (235) | (240)
Transfers into Level 3 | 329 | 242 | 350 | 265
Transfers out of Level 3 | (522) | (301) | (78) | (156)
Balance at end of period | 1,841 | 1,547 | 1,841 | 1,547
Significant Unobservable Inputs (Level 3) [Member] | Inventories Carried At Market [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance at beginning of period | 1,938 | 1,511 | 1,477 | 1,515
Total increase (decrease) in unrealized gains included in cost of products sold | 279 | 237 | 396 | 216
Purchases | 3,012 | 2,657 | 6,419 | 5,346
Sales | (3,625) | (2,958) | (7,135) | (5,782)
Settlements | 0 | 0 | 0 | 0
Transfers into Level 3 | 306 | 232 | 306 | 232
Transfers out of Level 3 | (511) | (291) | (64) | (139)
Balance at end of period | 1,399 | 1,388 | 1,399 | 1,388
Significant Unobservable Inputs (Level 3) [Member] | Commodity Derivative Contracts Gains [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance at beginning of period | 391 | 212 | 201 | 155
Total increase (decrease) in unrealized gains included in cost of products sold | 229 | 84 | 446 | 228
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | (190) | (137) | (235) | (240)
Transfers into Level 3 | 23 | 10 | 44 | 33
Transfers out of Level 3 | (11) | (10) | (14) | (17)
Balance at end of period | $ 442 | $ 159 | $ 442 | $ 159

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- Definition Amount of unrealized gain (loss) recognized in income from asset 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 Amount of gain (loss) recognized in income from asset 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 settlement of financial instrument classified as an asset 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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- Definition Amount of transfer of financial instrument classified as an asset 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 an asset 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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