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Asset Impairments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2013
Impaired Long-Lived Assets Held and Used [Line Items] |  |
Asset impairment charges, gross | $ 7 | $ 1,960
Asset impairment charges, net of taxes |  | 1,343
U.S. Oil And Gas Assets [Member] |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |
Asset impairment charges, gross |  | 1,110
Asset impairment charges, net of taxes |  | 707
Canada Oil And Gas Assets [Member] |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |
Asset impairment charges, gross |  | 843
Asset impairment charges, net of taxes |  | 632
Midstream Assets [Member] |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |
Asset impairment charges, gross |  | 7
Asset impairment charges, net of taxes |  | $ 4

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: 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=31042434&loc=d3e3602-108585 Reference 2: 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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