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Summary of Significant Accounting Policies Narrative (Details) (USD $) In Millions, unless otherwise specified |  |  |  |  | 12 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Restricted cash [Member] | Dec. 31, 2011 Restricted cash [Member] | Dec. 31, 2012 Automotive Segment [Member] | Dec. 31, 2011 Automotive Segment [Member] | Dec. 31, 2010 Automotive Segment [Member] | Dec. 31, 2012 Energy Segment [Member] | Dec. 31, 2012 Nitrogen Fertilizer [Member] Energy Segment [Member] | Dec. 31, 2012 Maximum [Member] | Dec. 31, 2012 Maximum [Member] Refineries [Member] Energy Segment [Member] | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2012 Minimum [Member] Refineries [Member] Energy Segment [Member]
Schedule of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | $ 1,419 | $ 4,979 | $ 700 | $ 4,800 | $ 0 | $ 0 |  | $ 0 |  |  |  |  |
Debt | 8,548 | 6,473 |  |  | 2,805 | 2,798 |  | 926 |  |  |  |  |
Fair value of long-term debt | 8,600 | 6,500 |  |  |  |  |  |  |  |  |  |  |
Planned major maintenance |  |  |  |  |  |  |  | 107 |  |  |  |  |
Planned major maintenance, frequency (in years) |  |  |  |  |  |  |  |  | 2 years |  | 5 years |  | 4 years
Special profits interest allocations percentage |  |  |  |  |  |  |  |  |  | 2.50% |  | 1.50% |
Incentive allocation percentage |  |  |  |  |  |  |  |  |  | 25.00% |  | 15.00% |
Research and development expense |  |  |  |  | $ 179 | $ 172 | $ 156 |  |  |  |  |  |

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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph g -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 Statement of Financial Accounting Standard (FAS) -Number 86 -Paragraph 11, 12 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 2 -Paragraph 12, 13 -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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