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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | $ 280 | $ 105 | $ 491 | $ 280
Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance at beginning of period | 1,723 | 1,945 | 1,670 | 1,597
Total increase (decrease) in unrealized gains included in cost of products sold | 321 | 114 | 444 | 441
Purchases | 2,657 | 2,133 | 5,346 | 4,372
Sales | (2,958) | (2,832) | (5,782) | (4,982)
Settlements | (137) | (78) | (240) | (144)
Transfers into Level 3 | 242 | 397 | 265 | 425
Transfers out of Level 3 | (301) | (93) | (156) | (123)
Balance at end of period | 1,547 | 1,586 | 1,547 | 1,586
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 | 1,511 | 1,829 | 1,515 | 1,486
Total increase (decrease) in unrealized gains included in cost of products sold | 237 | (11) | 216 | 269
Purchases | 2,657 | 2,133 | 5,346 | 4,372
Sales | (2,958) | (2,832) | (5,782) | (4,982)
Settlements | 0 | 0 | 0 | 0
Transfers into Level 3 | 232 | 340 | 232 | 340
Transfers out of Level 3 | (291) | (81) | (139) | (107)
Balance at end of period | 1,388 | 1,378 | 1,388 | 1,378
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 | 212 | 116 | 155 | 111
Total increase (decrease) in unrealized gains included in cost of products sold | 84 | 125 | 228 | 172
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements | (137) | (78) | (240) | (144)
Transfers into Level 3 | 10 | 57 | 33 | 85
Transfers out of Level 3 | (10) | (12) | (17) | (16)
Balance at end of period | $ 159 | $ 208 | $ 159 | $ 208

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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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