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Impairments (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended |  | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended
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Sep. 30, 2012 Aruba Refinery [Member] | Mar. 31, 2012 Aruba Refinery [Member] | Mar. 28, 2012 Aruba Refinery [Member] | Sep. 30, 2012 Refining Assets [Member] | Mar. 31, 2012 Refining Assets [Member] | Sep. 30, 2012 Inventory Related Assets [Member] | Mar. 31, 2012 Construction in Progress [Member] | Mar. 31, 2012 Construction in Progress [Member]
Impairments (Textual) |  |  |  |  |  |  |  |
Non-binding purchase offer |  |  | $ 350 |  |  |  |  |
Asset impairment loss | $ 333 | $ 595 |  | $ 308 | $ 595 | $ 25 | $ 16 | $ 16

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- Definition The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 45, 46, 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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- Details
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- Definition Non-binding indication of a third party's interest to purchase an asset or group of assets. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant