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Fair Value Measurements (Reconciliation Of Assets Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at beginning of period | $ 1,678 | $ 1,670
Total increase (decrease) in unrealized gains included in cost of products sold | 1,084 | 744
Purchases | 14,185 | 10,833
Sales | (13,852) | (11,167)
Settlements | (257) | (421)
Transfers into Level 3 | 360 | 182
Transfers out of Level 3 | (156) | (163)
Balance at end of period | 3,042 | 1,678
Inventories Carried At Market [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at beginning of period | 1,477 | 1,515
Total increase (decrease) in unrealized gains included in cost of products sold | 146 | 327
Purchases | 14,185 | 10,833
Sales | (13,852) | (11,167)
Transfers into Level 3 | 290 | 108
Transfers out of Level 3 | (63) | (139)
Balance at end of period | 2,183 | 1,477
Commodity Derivative Contracts Gains [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at beginning of period | 201 | 155
Total increase (decrease) in unrealized gains included in cost of products sold | 938 | 417
Settlements | (257) | (421)
Transfers into Level 3 | 70 | 74
Transfers out of Level 3 | (93) | (24)
Balance at end of period | $ 859 | $ 201

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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 purchases 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 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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