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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | $ 392 | $ 165 | $ 1,200 | $ 656
Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance at beginning of period | 1,841 | 1,547 | 1,678 | 1,670
Total increase (decrease) in unrealized gains included in cost of products sold | 544 | 118 | 1,358 | 467
Purchases | 3,181 | 2,772 | 9,600 | 8,118
Sales | (2,703) | (2,643) | (9,838) | (8,425)
Settlements | (96) | (106) | (331) | (346)
Transfers into Level 3 | 303 | 234 | 347 | 267
Transfers out of Level 3 | (398) | (331) | (142) | (160)
Balance at end of period | 2,672 | 1,591 | 2,672 | 1,591
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 | 1,399 | 1,388 | 1,477 | 1,515
Total increase (decrease) in unrealized gains included in cost of products sold | 258 | 27 | 626 | 148
Purchases | 3,181 | 2,772 | 9,600 | 8,118
Sales | (2,703) | (2,643) | (9,838) | (8,425)
Settlements | 0 | 0 | 0 | 0
Transfers into Level 3 | 290 | 213 | 290 | 213
Transfers out of Level 3 | (333) | (327) | (63) | (139)
Balance at end of period | 2,092 | 1,430 | 2,092 | 1,430
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 | 442 | 159 | 201 | 155
Total increase (decrease) in unrealized gains included in cost of products sold | 286 | 91 | 732 | 319
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | (96) | (106) | (331) | (346)
Transfers into Level 3 | 13 | 21 | 57 | 54
Transfers out of Level 3 | (65) | (4) | (79) | (21)
Balance at end of period | $ 580 | $ 161 | $ 580 | $ 161

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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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