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Segment and Geographic Information (Details 1) (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
Schedule of revenue and long-lived assets by geographic region |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 1,226 | $ 1,116 | $ 1,072 | $ 1,035 | $ 1,004 | $ 971 | $ 1,020 | $ 959 | $ 4,450 | $ 3,954 | $ 3,639
Long-lived Assets | 2,944 |  |  |  | 1,957 |  |  |  | 2,944 | 1,957 |
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of revenue and long-lived assets by geographic region |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 2,684 | 2,373 | 2,253
Long-lived Assets | 2,376 |  |  |  | 873 |  |  |  | 2,376 | 873 |
European region [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of revenue and long-lived assets by geographic region |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,067 | 951 | 839
Long-lived Assets | 441 |  |  |  | 638 |  |  |  | 441 | 638 |
Asia [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of revenue and long-lived assets by geographic region |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 454 | 423 | 357
Long-lived Assets | 70 |  |  |  | 406 |  |  |  | 70 | 406 |
Rest of the world [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of revenue and long-lived assets by geographic region |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 245 | 207 | 190
Long-lived Assets | $ 57 |  |  |  | $ 40 |  |  |  | $ 57 | $ 40 |

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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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