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Partners' Capital Preferred unit distribution (Tables) | 12 Months Ended
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Dec. 31, 2017
Distributions Made to Limited Partner, by Distribution | Cash distributions paid were as follows:
|  | Limited Partners |  |
Payment Date |  | Per Unit Distribution |  | Total Cash Distribution |  | Distribution to IDR Holders
|  | (in millions, except per unit amounts)
February 14, 2018 |  | $ | 0.8255 |  |  | $ | 82 |  |  | $ | 21 |
November 14, 2017 |  | $ | 0.8255 |  |  | $ | 82 |  |  | $ | 22 |
August 15, 2017 |  | $ | 0.8255 |  |  | $ | 82 |  |  | $ | 21 |
May 16, 2017 |  | $ | 0.8255 |  |  | $ | 82 |  |  | $ | 21 |
February 16, 2017 |  | $ | 0.8255 |  |  | $ | 81 |  |  | $ | 21 |
November 15, 2016 |  | $ | 0.8255 |  |  | $ | 79 |  |  | $ | 20 |
August 15, 2016 |  | $ | 0.8255 |  |  | $ | 79 |  |  | $ | 20 |
May 16, 2016 |  | $ | 0.8173 |  |  | $ | 78 |  |  | $ | 20 |
February 16, 2016 |  | $ | 0.8013 |  |  | $ | 70 |  |  | $ | 17 |
November 27, 2015 |  | $ | 0.7454 |  |  | $ | 47 |  |  | $ | 8 |
August 28, 2015 |  | $ | 0.6934 |  |  | $ | 29 |  |  | $ | 3 |
May 29, 2015 |  | $ | 0.6450 |  |  | $ | 23 |  |  | $ | 1 |
February 27, 2015 |  | $ | 0.6000 |  |  | $ | 21 |  |  | $ | 1 |
Series A Preferred Unit [Member] |
Distributions Made to Limited Partner, by Distribution |
|  | Series A Preferred Unit Holder
Payment Date |  | Total Cash Distribution
|  | (in millions)
February 14, 2018 |  | $ | 8 |
November 14, 2017 |  | $ | 7 |
August 15, 2017 |  | $ | 8 |

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