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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, 2021 | Dec. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at beginning of period | $ 3,042 | $ 1,678
Total increase (decrease) in unrealized gains included in cost of products sold | 2,202 | 1,084
Purchases | 30,357 | 14,185
Sales | (30,471) | (13,852)
Settlements | (1,437) | (257)
Transfers into Level 3 | 1,303 | 360
Transfers out of Level 3 | (1,532) | (156)
Balance at end of period | 3,464 | 3,042
Inventories Carried At Market [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at beginning of period | 2,183 | 1,477
Total increase (decrease) in unrealized gains included in cost of products sold | 1,131 | 146
Purchases | 30,357 | 14,185
Sales | (30,471) | (13,852)
Transfers into Level 3 | 1,200 | 290
Transfers out of Level 3 | (1,396) | (63)
Balance at end of period | 3,004 | 2,183
Commodity Derivative Contracts Gains [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at beginning of period | 859 | 201
Total increase (decrease) in unrealized gains included in cost of products sold | 1,071 | 938
Settlements | (1,437) | (257)
Transfers into Level 3 | 103 | 70
Transfers out of Level 3 | (136) | (93)
Balance at end of period | $ 460 | $ 859

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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=123874694&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=123874694&loc=d3e19207-110258 + Details
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