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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, 2020 | Dec. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at beginning of period | $ 226 | $ 263
Total increase (decrease) in unrealized gains included in cost of products sold | 1,746 | 397
Purchases | 37 | 48
Sales | (36) | (38)
Settlements | (1,059) | (451)
Transfers into Level 3 | 112 | 51
Transfers out of Level 3 | (63) | (44)
Balance at end of period | 963 | 226
Commodity Derivative Contracts Losses [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at beginning of period | 199 | 245
Total increase (decrease) in unrealized gains included in cost of products sold | 1,729 | 398
Purchases | 0 | 0
Sales | 0 | 0
Settlements | (1,059) | (451)
Transfers into Level 3 | 112 | 51
Transfers out of Level 3 | (63) | (44)
Balance at end of period | 918 | 199
Inventory Related Payables [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at beginning of period | 27 | 18
Total increase (decrease) in unrealized gains included in cost of products sold | 0 | (1)
Purchases | 20 | 48
Sales | (36) | (38)
Settlements | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Balance at end of period | 11 | 27
Long-term Debt |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Balance at beginning of period | 0 |
Sales | 0 |
Settlements | 0 |
Transfers into Level 3 | 0 |
Transfers out of Level 3 | $ 0 |
Balance at end of period |  | $ 0

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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=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a liability 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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- Definition Amount of gain (loss) recognized in income from liability 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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