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Segment Information, Geographic Information by Country for Revenue and Long-Lived Assets (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Operating revenues by geographic area |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 34,429 | $ 36,137 | $ 34,034 | [1] | $ 33,474 | $ 34,695 | $ 34,726 | $ 34,662 | $ 35,167 | [1],[2] | $ 138,074 | $ 139,250 | $ 125,987
Geographic information by country for long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 27,059 |  |  |  |  | 27,587 |  |  |  |  | 27,059 | 27,587 |
U.S. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues by geographic area |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | 100,418 | 100,733 | 98,806
Geographic information by country for long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 23,572 |  |  |  |  | 23,760 |  |  |  |  | 23,572 | 23,760 |
Canada [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues by geographic area |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | 9,974 | 10,376 | 10,110
Geographic information by country for long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 2,260 |  |  |  |  | 2,639 |  |  |  |  | 2,260 | 2,639 |
U.K. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues by geographic area |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | 11,358 | 10,779 | 4,297
Geographic information by country for long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 1,148 |  |  |  |  | 1,110 |  |  |  |  | 1,148 | 1,110 |
Other countries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues by geographic area |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | 16,324 | 17,362 | 12,774
Aruba [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Geographic information by country for long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 53 |  |  |  |  | 41 |  |  |  |  | 53 | 41 |
Ireland [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Geographic information by country for long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | $ 26 |  |  |  |  | $ 37 |  |  |  |  | $ 26 | $ 37 |
[1] | The separation of our retail business was completed on May 1, 2013.
[2] | The operations of the Aruba Refinery were suspended in March 2012.

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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 + Details
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- Definition Revenue related to the downstream oil and gas activities, including the refining of crude oil, as well as the marketing and distribution of crude oil, refined petroleum products, and natural gas. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62246-109447 + Details
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