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Fair Value Measurements (Reconciliation Of All Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Significant Unobservable Inputs (Level 3) (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended
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Dec. 31, 2011 Significant Unobservable Inputs (Level 3) [Member] | Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] | Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] | Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Inventories Carried At Market [Member] | Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Inventories Carried At Market [Member] | Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Commodity Derivative Contracts Gains [Member] | Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Commodity Derivative Contracts Gains [Member] | Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Inventory Related Payables [Member] | Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Inventory Related Payables [Member] | Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Commodity Derivative Contracts Losses [Member] | Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Commodity Derivative Contracts Losses [Member] | Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] Inventories Carried At Market, Net [Member] | Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] Inventories Carried At Market, Net [Member] | Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] Commodity Derivative Contracts, Net [Member] | Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] Derivative Contracts, Net [Member] | Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Total Assets [Member] | Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Total Assets [Member] | Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Total Liabilities [Member] | Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Total Liabilities [Member]
Threshold of relative value of unobservable inputs to the total fair value for Level 3 | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | $ 1,348 | $ 762 | $ 270 | $ 112 |  |  |  |  |  |  |  |  | $ 1,618 | $ 874 |  |
Total increase (decrease) in unrealized gains included in cost of products sold |  |  |  | 28 | (18) | 138 | 335 |  |  |  |  |  |  |  |  | 166 | 317 |  |
Purchases |  |  |  | 959 | 1,095 |  | 4 |  |  |  |  |  |  |  |  | 959 | 1,099 |  |
Sales |  |  |  | (963) | (1,224) |  |  |  |  |  |  |  |  |  |  | (963) | (1,224) |  |
Settlements |  |  |  |  |  | (185) | (244) |  |  |  |  |  |  |  |  | (185) | (244) |  |
Transfers into Level 3 |  |  |  | 306 | 1,073 | 34 | 84 |  |  |  |  |  |  |  |  | 340 | 1,157 |  |
Transfers out of Level 3 |  |  |  | (54) | (64) | (59) | (93) |  |  |  |  |  |  |  |  | (113) | (157) |  |
Balance at end of period |  |  |  | 1,624 | 1,624 | 198 | 198 |  |  |  |  |  |  |  |  | 1,822 | 1,822 |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  |  |  |  |  | 134 | 45 | 244 | 44 |  |  |  |  |  |  | 378 | 89
Total increase (decrease) in unrealized losses included in cost of products sold |  |  |  |  |  |  |  | 4 | 4 | 136 | 306 |  |  |  |  |  |  | 140 | 310
Purchases |  |  |  |  |  |  |  | 4 | (2) |  | 1 |  |  |  |  |  |  | 4 | (1)
Sales |  |  |  |  |  |  |  | (6) | (4) |  |  |  |  |  |  |  |  | (6) | (4)
Settlements |  |  |  |  |  |  |  |  |  | (158) | (139) |  |  |  |  |  |  | (158) | (139)
Transfers into Level 3 |  |  |  |  |  |  |  | 60 | 153 | 4 | 19 |  |  |  |  |  |  | 64 | 172
Transfers out of Level 3 |  |  |  |  |  |  |  |  |  | (34) | (39) |  |  |  |  |  |  | (34) | (39)
Balance at end of period |  |  |  |  |  |  |  | 196 | 196 | 192 | 192 |  |  |  |  |  |  | 388 | 388
Fair Value, Assets and Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | 406 | 440 |  |  |  |  |  |  |  |  | 371 | 427 | 35 | 13 |  |  |  |
Total gains (losses), realized or unrealized, included in earnings before income taxes |  | 35 | 102 |  |  |  |  |  |  |  |  | (27) | 4 | 62 | 98 |  |  |  |
Purchases, issuances and settlements |  | 44 | 117 |  |  |  |  |  |  |  |  | 43 | 114 | 1 | 3 |  |  |  |
Transfers into Level 3 |  | 1 | 8 |  |  |  |  |  |  |  |  | 2 | 8 | (1) |  |  |  |  |
Transfers out of Level 3 |  | (88) | (269) |  |  |  |  |  |  |  |  | (83) | (247) | (5) | (22) |  |  |  |
Balance at end of period |  | 398 | 398 |  |  |  |  |  |  |  |  | 306 | 306 | 92 | 92 |  |  |  |
Unrealized gains (losses) on derivative assets and liabilities |  | $ 122 | $ 169 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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- Definition Purchases that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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- Definition Settlements that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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- Definition This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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- Definition This element represents total gains or losses for the period (realized and unrealized), arising from liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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- Definition Purchases that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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- Definition Settlements that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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- Definition This element represents a liability measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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