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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], Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Assets [Member] |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Unrealized gains on derivative assets | $ 134 |  |  | $ 264 |  |
Inventories Carried At Market [Member] |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Balance at beginning of period | 2,022 |  | 1,725 | 1,745 |  | 1,624
Total increase (decrease) in unrealized gains included in cost of products sold | 172 | [1] | 35 | (516) | [2] | 76
Purchases | 4,215 |  | 840 | 8,899 |  | 2,126
Sales | (4,611) |  | (1,106) | (8,312) |  | (1,391)
Settlements | 0 |  | 0 | 0 |  | 0
Transfers into Level 3 | 160 |  | 88 | 160 |  | 160
Transfers out of Level 3 | (32) |  | (120) | (50) |  | (1,133)
Balance at end of period | 1,926 |  | 1,462 | 1,926 |  | 1,462
Commodity Derivative Contracts Gains [Member] |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Balance at beginning of period | 223 |  | 232 | 143 |  | 198
Total increase (decrease) in unrealized gains included in cost of products sold | 93 | [1] | 92 | 229 | [2] | 257
Purchases | 0 |  | (2) | 0 |  | (2)
Sales | 0 |  | 0 | 0 |  | 0
Settlements | (132) |  | (146) | (228) |  | (246)
Transfers into Level 3 | 92 |  | 5 | 140 |  | 24
Transfers out of Level 3 | (9) |  | (10) | (17) |  | (60)
Balance at end of period | 267 |  | 171 | 267 |  | 171
Total Assets [Member] |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Balance at beginning of period | 2,245 |  | 1,957 | 1,888 |  | 1,822
Total increase (decrease) in unrealized gains included in cost of products sold | 265 | [1] | 127 | (287) | [2] | 333
Purchases | 4,215 |  | 838 | 8,899 |  | 2,124
Sales | (4,611) |  | (1,106) | (8,312) |  | (1,391)
Settlements | (132) |  | (146) | (228) |  | (246)
Transfers into Level 3 | 252 |  | 93 | 300 |  | 184
Transfers out of Level 3 | (41) |  | (130) | (67) |  | (1,193)
Balance at end of period | $ 2,193 |  | $ 1,633 | $ 2,193 |  | $ 1,633
[1] | Includes gains of $134 million that are attributable to the change in unrealized gains relating to Level 3 assets still held at June 30, 2013.
[2] | Includes gains of $264 million that are attributable to the change in unrealized gains relating to Level 3 assets still held at June 30, 2013.

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- Definition Represents amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in earnings, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3). + 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)(1) -URI http://asc.fasb.org/extlink&oid=7578670&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=7578670&loc=d3e19207-110258 + Details
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- Definition Sales 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=7578670&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=7578670&loc=d3e19207-110258 + Details
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- Definition Transfers into assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period. + 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)(3) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Transfers out of assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period. + 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)(3) -URI http://asc.fasb.org/extlink&oid=7578670&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 Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: 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. + Details
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