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Equity and Distributions (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Common units [Member] | Dec. 31, 2011 Common units [Member] | Dec. 31, 2010 Common units [Member] | Dec. 31, 2012 Class B units [Member] | Dec. 31, 2011 Class B units [Member] | Dec. 31, 2012 Treasury Units [Member] | Dec. 31, 2010 Holdings Merger [Member] | Dec. 31, 2010 Holdings Merger [Member] Common units [Member] | Nov. 21, 2010 Holdings Merger [Member] Common units [Member] | Dec. 31, 2011 Duncan Merger [Member] | Dec. 31, 2011 Duncan Merger [Member] Common units [Member] | Sep. 06, 2011 Duncan Merger [Member] Common units [Member] | Dec. 31, 2009 TEPPCO Merger [Member] Class B units [Member]
Mergers [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units outstanding (in units) |  |  | 898,813,337 | 881,620,418 |  | 4,520,431 | 4,520,431 |  |  |  | 139,195,064 |  |  | 24,036,950 |
Common unit exchange ratio in connection with merger |  |  |  |  |  |  |  |  | 1.5 | 1.5 |  | 1.01 | 1.01 |  | 1.24
Common units issued in connection with merger (in units) |  |  |  |  |  |  |  |  |  | 208,813,454 |  |  | 24,277,310 |  | 4,520,431
Common units cancelled immediately after merger (in units) |  |  |  |  | 21,563,177 |  |  |  |  | 21,563,177 |  |  |  |  |
Equity transferred pursuant to Holdings Merger |  | $ 0 |  |  |  |  |  |  | $ 8,880.0 |  |  |  |  |  |
Equity transferred pursuant to Duncan Merger | 0 |  |  |  |  |  |  |  |  |  |  | 401.7 |  |  |
Number of quarters Class B units are not entitled to regular quarterly cash distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16
Treasury Units [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum common units authorized for repurchase under a buy-back program (in units) |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |
Maximum remaining common units authorized for repurchase under a buy-back program (in units) |  |  |  |  |  |  |  | 618,400 |  |  |  |  |  |  |
Conversion of restricted units and similar awards to common units (in units) |  |  | 1,356,204 |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of treasury units in connection with vesting of equity-based awards (in units) |  |  | (408,241) | (255,276) | (103,241) |  |  | 408,241 |  |  |  |  |  |  |
Total cost of treasury units |  |  |  |  |  |  |  | $ 20.9 |  |  |  |  |  |  |

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