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Price Risk Management Activities, Gain (Loss) by Income Statement Location (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Price Risk Management Activities (Textual) |  |  |  |
Gain (loss) from hedged firm commitment not qualifying as fair value hedge, net | $ 0 | $ 0 | $ 0 | $ 28
Accumulated other comprehensive income, cumulative after-tax losses on cash flow hedges | (4) |  | (4) |
Gain (loss) from cash flow hedges to be reclassified within 12 months |  |  | (4) |
Fair Value Hedging [Member] | Commodity Contract [Member] | Cost of Sales [Member] |  |  |  |
Effect of Derivative Instruments on Income and OCI |  |  |  |
Gain (loss) recognized in income on derivatives | (17) | (127) | (38) | (307)
Gain recognized in income on hedged item | 19 | 101 | 41 | 238
Gain (loss) recognized in income on derivatives (ineffective portion) | 2 | (26) | 3 | (69)
Cash Flow Hedging [Member] | Commodity Contract [Member] |  |  |  |
Effect of Derivative Instruments on Income and OCI |  |  |  |
Gain (loss) recognized in OCI on derivatives (effective portion) | 3 | 27 | (6) | 43
Cash Flow Hedging [Member] | Commodity Contract [Member] | Cost of Sales [Member] |  |  |  |
Effect of Derivative Instruments on Income and OCI |  |  |  |
Gain reclassified from accumulated OCI into income (effective portion) | 6 | 45 | 1 | 81
Gain (loss) recognized in income on derivatives (ineffective portion) | 16 | (3) | 13 | 23
Economic Hedging [Member] |  |  |  |
Effect of Derivative Instruments on Income and OCI |  |  |  |
Gain (loss) recognized in income on derivatives | (98) | (354) | 219 | 47
Economic Hedging [Member] | Commodity Contract [Member] | Cost of Sales [Member] |  |  |  |
Effect of Derivative Instruments on Income and OCI |  |  |  |
Gain (loss) recognized in income on derivatives | (76) | (333) | 205 | 90
Economic Hedging [Member] | Foreign Currency Contract [Member] | Cost of Sales [Member] |  |  |  |
Effect of Derivative Instruments on Income and OCI |  |  |  |
Gain (loss) recognized in income on derivatives | (22) | (21) | 14 | (43)
Trading Derivatives [Member] |  |  |  |
Effect of Derivative Instruments on Income and OCI |  |  |  |
Gain (loss) recognized in income on derivatives | 11 | (13) | (4) | (9)
Trading Derivatives [Member] | Commodity Contract [Member] | Cost of Sales [Member] |  |  |  |
Effect of Derivative Instruments on Income and OCI |  |  |  |
Gain (loss) recognized in income on derivatives | 11 | (13) | 16 | (9)
Trading Derivatives [Member] | RINs Fixed-Price Contracts [Member] | Cost of Sales [Member] |  |  |  |
Effect of Derivative Instruments on Income and OCI |  |  |  |
Gain (loss) recognized in income on derivatives | $ 0 | $ 0 | $ (20) | $ 0

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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80784-113994 + Details
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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994 + Details
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- Definition Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624177-113959 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition Amount of net gain (loss) recognized in earnings when a hedged firm commitment no longer qualifies as a fair value hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition Amount of gain (loss)recognized in the income statement from the hedging ineffectiveness of a fair value hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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