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Partners' Capital Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Schedule of Partners' Capital [Line Items] |  |
Percentage of membership interest acquired | 100.00% |
Common Units - Public [Member] |  |
Schedule of Partners' Capital [Line Items] |  |
Limited Partners' Capital Account, Units Outstanding | 53,704,891 | 52,430,220
Common Units [Member] |  |
Schedule of Partners' Capital [Line Items] |  |
Limited Partners' Capital Account, Units Outstanding | 99,455,717 | 98,181,046
Partners' Capital Account, Public Sale of Units, Amount Authorized | $ 400 |
Partners' Capital Account, Units, Sale of Units | 1,268,750 |
Partners' Capital Account, Private Placement of Units | $ 33 |
Payments of Stock Issuance Costs | 0 |
Equity Distribution, Remaining Available Authorized Amount | $ 295 |
Parent Company [Member] |  |
Schedule of Partners' Capital [Line Items] |  |
Percentage of membership interest acquired | 46.00% |
Parent Company [Member] | Common Units [Member] |  |
Schedule of Partners' Capital [Line Items] |  |
Limited Partners' Capital Account, Units Outstanding | 45,750,826 |

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