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Partners' Capital and Distributions (Details 9) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended | 9 Months Ended |  | 12 Months Ended |  | 0 Months Ended | 1 Months Ended | 12 Months Ended
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Oct. 02, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 May 2012 Continuous Offering Program | May 09, 2012 May 2012 Continuous Offering Program | Dec. 31, 2012 September 2012 Continuous Offering Program | Sep. 13, 2012 September 2012 Continuous Offering Program | Oct. 02, 2012 Other Equity Offerings | Mar. 31, 2012 Other Equity Offerings | Nov. 30, 2011 Other Equity Offerings | Mar. 31, 2011 Other Equity Offerings | Nov. 30, 2010 Other Equity Offerings | Dec. 31, 2012 Other Equity Offerings | Dec. 31, 2011 Other Equity Offerings | Dec. 31, 2010 Other Equity Offerings
Partners Capital and Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum aggregate offer price of common stock |  |  |  |  |  | $ 300 |  | $ 500 |  |  |  |  |  |  |  |
Units Sold |  | 23,500,000 | 27,900,000 | 9,600,000 | 7,200,000 |  | 4,800,000 |  |  | 11,500,000 | 12,000,000 | 15,870,000 | 9,560,000 | 11,500,000 | 27,870,000 | 9,560,000
Unit split conversion ratio | 2 |  |  |  | 2 |  | 2 |  | 2 |  |  |  |  |  |  |
Gross Unit Price (in dollars per unit) |  |  |  |  |  |  |  |  |  | $ 40.015 | $ 32.515 | $ 32.000 | $ 31.300 |  |  |
Proceeds from Sale |  |  |  |  | 302 |  | 222 |  |  | 460 | 390 | 508 | 299 | 460 | 898 | 299
General Partner Contribution |  |  |  |  |  |  |  |  |  | 9 | 9 | 10 | 6 | 9 | 19 | 6
Costs |  |  |  |  |  |  |  |  |  | (14) | (13) | (15) | (9) | (14) | (28) | (9)
Net Proceeds |  | 979 | 889 | 296 |  |  |  |  |  | 455 | 386 | 503 | 296 | 455 | 889 | 296
Commissions paid |  |  |  |  | $ 4 |  | $ 2 |  |  |  |  |  |  |  |  |

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- Definition Total change in each class of partners' capital accounts during the year due to the sale of units. All partners include general, limited and preferred partners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Practice Bulletin (PB) -Number 14 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 -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. + Details
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