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Partners' Capital and Distributions - Distributions (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 3 Months Ended
--- | --- | --- | --- | ---
May. 13, 2016 | Apr. 07, 2016 | Feb. 12, 2016 | Mar. 31, 2016 | Mar. 31, 2015
Partners Capital and Distributions |  |  |  |  |
Total distributions paid |  |  |  | $ 434 | $ 391
Fourth Quarter Distribution |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Distribution declared, date |  |  | Jan. 12, 2016 |  |
Distribution payment date |  |  | Feb. 12, 2016 |  |
Forecast | First Quarter Distribution |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Distribution payment date | May 13, 2016 |  |  |  |
Subsequent Event | First Quarter Distribution |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Distribution declared, date |  | Apr. 07, 2016 |  |  |
Unitholders of record, date |  | Apr. 29, 2016 |  |  |
Partners' Capital Excluding Noncontrolling Interests |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Total distributions paid |  |  |  | $ 433 | $ 390
Partners' Capital Excluding Noncontrolling Interests | Cash Distributions | Fourth Quarter Distribution |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Distributions paid to General Partner |  |  | $ 155 |  |
Total distributions paid |  |  | $ 433 |  |
Partners' Capital Excluding Noncontrolling Interests | Cash Distributions | Forecast | First Quarter Distribution |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Distributions paid to General Partner | $ 155 |  |  |  |
Total distributions paid | 433 |  |  |  |
Common Units | Cash Distributions | Fourth Quarter Distribution |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Distributions per common unit, paid (in dollars per unit) |  |  | $ 0.70 |  |
Common Units | Cash Distributions | Subsequent Event | First Quarter Distribution |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Distributions per common unit, declared (in dollars per unit) |  | $ 0.70 |  |  |
Common Units | Partners' Capital Excluding Noncontrolling Interests | Cash Distributions | Fourth Quarter Distribution |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Distributions paid to Unitholders |  |  | $ 278 |  |
Common Units | Partners' Capital Excluding Noncontrolling Interests | Cash Distributions | Forecast | First Quarter Distribution |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Distributions paid to Unitholders | 278 |  |  |  |
Series A Preferred Units | Partners' Capital Excluding Noncontrolling Interests | In-Kind Distributions | Forecast | First Quarter Distribution |  |  |  |  |
Partners Capital and Distributions |  |  |  |  |
Distributions paid to Unitholders | $ 23 |  |  |  |
Distribution of units in lieu of cash (in units) | 858,439 |  |  |  |

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