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Operating Segments (Details 3) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Revenues and long lived assets attributable to geographic areas |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 9,439 | $ 9,354 | $ 9,786 | $ 9,218 | $ 8,884 | $ 8,837 | $ 8,859 | $ 7,694 | $ 37,797 | $ 34,275 | $ 25,893
Long Lived Assets | 14,078 |  |  |  | 11,010 |  |  |  | 14,078 | 11,010 |
United States |  |  |  |  |  |  |  |  |  |  |
Revenues and long lived assets attributable to geographic areas |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 29,978 | 28,181 | 21,471
Long Lived Assets | 10,401 |  |  |  | 9,127 |  |  |  | 10,401 | 9,127 |
Canada |  |  |  |  |  |  |  |  |  |  |
Revenues and long lived assets attributable to geographic areas |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 7,819 | 6,094 | 4,422
Long Lived Assets | $ 3,677 |  |  |  | $ 1,883 |  |  |  | $ 3,677 | $ 1,883 |

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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + 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=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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