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Fair Value Measurements (Reconciliation Of Assets Measured At Fair Value On A Recurring Basis) (Details) - Significant Unobservable Inputs (Level 3) [Member] - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at beginning of period | $ 3,444 | $ 3,301
Total increase (decrease) in unrealized gains included in cost of products sold | 278 | 479
Purchases | 3,789 | 8,665
Sales | (3,883) | (8,254)
Settlements | (352) | (382)
Transfers into Level 3 | 544 | 655
Transfers out of Level 3 | (108) | (312)
Balance at end of period | 3,712 | 4,152
Inventories Carried At Market [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at beginning of period | 2,713 | 2,760
Total increase (decrease) in unrealized gains included in cost of products sold | (97) | 2
Purchases | 3,789 | 8,665
Sales | (3,883) | (8,254)
Settlements | 0 | 0
Transfers into Level 3 | 516 | 605
Transfers out of Level 3 | (90) | (275)
Balance at end of period | 2,948 | 3,503
Commodity Derivative Contracts Gains [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at beginning of period | 731 | 541
Total increase (decrease) in unrealized gains included in cost of products sold | 375 | 477
Purchases | 0 | 0
Sales | 0 | 0
Settlements | (352) | (382)
Transfers into Level 3 | 28 | 50
Transfers out of Level 3 | (18) | (37)
Balance at end of period | $ 764 | $ 649

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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 -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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