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Partners' Capital and Distributions (Details 4) (USD $) In Millions, except Per Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 12 Months Ended
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Feb. 14, 2013 | Jan. 07, 2013 | Oct. 02, 2012 | 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, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Partners' Capital and Distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash distributions paid to common unit holders | $ 189 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 684 | $ 575 | $ 512
Cash distribution paid to General Partner - Incentive | 81 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 271 | 204 | 160
Cash distributions paid to General Partner - 2% | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 | 12 | 10
Total distributions paid during the period | $ 274 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 969 | $ 791 | $ 682
Cash distributions per limited partner unit (in dollars per unit) |  |  |  | $ 0.5425 | $ 0.5325 | $ 0.5225 | $ 0.5125 | $ 0.4975 | $ 0.4913 | $ 0.4850 | $ 0.4788 | $ 0.4750 | $ 0.4713 | $ 0.4675 | $ 0.4638 | $ 2.1100 | $ 1.9525 | $ 1.88
Unit split conversion ratio |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unitholders of record, date | Feb. 01, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash distribution declared (in dollars per unit) |  | $ 0.5625 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Cash dividends declared or paid to each outstanding limited partnership unit during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187171-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section F + Details
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- Definition Amount of incentive obligation paid in cash or stock during the period to a limited liability corporation managing member or limited partnership general partner. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 07-4 -Paragraph 2, 9 -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 AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 + Details
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