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Partners' Capital and Distributions (Narrative) (Details) $ / shares in Units, $ in Millions |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 10, 2015 USD ($) $ / shares shares | Dec. 31, 2014 $ / shares shares | Mar. 31, 2015 $ / shares shares | Sep. 30, 2014 $ / shares | Jun. 30, 2014 $ / shares | Mar. 31, 2014 shares | Dec. 31, 2013 shares
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |
Common units, issued |  | 95,029,218 | 95,029,218 |  |  |  |
Common units, outstanding |  | 95,029,218 | 95,029,218 |  |  | 88,691,000 | 88,691,000
Distribution paid per common unit | $ / shares |  | $ 0.5800 | $ 0.5950 | $ 0.5650 | $ 0.5500 |  |
Class A [Member] |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |
Common units, outstanding |  |  | 94,989,221 |  |  |  |
Class B [Member] |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |
Common units, outstanding |  |  | 39,997 |  |  |  |
Class Two [Member] |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |
Conversion Feature, Minimum Distribution Coverage Ratio |  | 1.1 |  |  |  |  |
Class Three [Member] |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |
Conversion Feature, Minimum Distribution Coverage Ratio |  | 1.1 |  |  |  |  |
Class Four [Member] |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |
Conversion Feature, Minimum Distribution Coverage Ratio |  | 1.1 |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |
Sale of Stock, Price Per Share | $ / shares | $ 44.42 |  |  |  |  |  |
Limited Partners' Capital Accountant, Option To Purchase | 600,000 |  |  |  |  |  |
Partners' Capital Account, Public Sale of Units Net of Offering Costs | $ | $ 198 |  |  |  |  |  |
Common units, issued | 4,600,000 |  |  |  |  |  |

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