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Partners' Capital and Distributions (Narrative) (Details) $ / shares in Units, $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 22, 2015 USD ($) $ / shares shares | Apr. 10, 2015 USD ($) $ / shares shares | Dec. 31, 2014 shares | Sep. 30, 2015 shares
Partners Capital And Distributions [Line Items] |  |  |  |
Limited Partners' Capital Account, Units Outstanding |  |  | 95,029,218 | 109,979,218
Common units, issued | 10,350,000 | 4,600,000 | 95,029,218 | 109,979,218
Sale of Stock, Price Per Share | $ / shares | $ 43.77 | $ 44.42 |  |
Limited Partners' Capital Accountant, Option To Purchase | 1,350,000 | 600,000 |  |
Partners' Capital Account, Public Sale of Units Net of Offering Costs | $ | $ 437 | $ 198 |  |
Class A [Member] |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |
Limited Partners' Capital Account, Units Outstanding |  |  |  | 109,939,221
Class B [Member] |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |
Limited Partners' Capital Account, 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 |

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