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Fair Value Measurements (Reconciliation Of Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at beginning of period | $ 963 | $ 226
Total increase (decrease) in unrealized gains included in cost of products sold | 1,975 | 1,746
Purchases | 123 | 37
Sales | (30) | (36)
Settlements | (2,191) | (1,059)
Transfers into Level 3 | 324 | 112
Transfers out of Level 3 | (228) | (63)
Balance at end of period | 936 | 963
Commodity Derivative Contracts Losses [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at beginning of period | 918 | 199
Total increase (decrease) in unrealized gains included in cost of products sold | 1,992 | 1,729
Purchases | 0 | 0
Sales | 0 | 0
Settlements | (2,191) | (1,059)
Transfers into Level 3 | 324 | 112
Transfers out of Level 3 | (228) | (63)
Balance at end of period | 815 | 918
Inventory Related Payables [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at beginning of period | 11 | 27
Total increase (decrease) in unrealized gains included in cost of products sold | 2 | 0
Purchases | 123 | 20
Sales | (30) | (36)
Settlements | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Balance at end of period | 106 | 11
Long-term Debt |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Sales | 0 |
Settlements | 0 |
Transfers into Level 3 | 0 |
Transfers out of Level 3 | 0 |
Balance at end of period | 15 |
Long-term Debt | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at beginning of period | 34 | 0
Total increase (decrease) in unrealized gains included in cost of products sold | $ 19 | (17)
Purchases |  | 17
Balance at end of period |  | $ 34

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- Definition Amount of transfers of financial instrument classified as a liability 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=123874694&loc=d3e19207-110258 + Details
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