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Partners' Capital (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2018
Partners' Capital [Abstract] |
Distribution of Preferred Unit [Table Text Block] |
|  | Series A Preferred Unit Holder
Payment Date |  | Total Cash Distribution
|  | (in millions)
January 25, 2018 (1) |  | $ | 10 |
Schedule of Common Units | Activity of our common units for the three months ended March 31, 2018 is as follows:
| Number of Units
Number of common units at December 31, 2017 | 99,667,999 |
Common units repurchase | (17,286,859 | )
Phantom unit vesting | 110,868 |
Number of common units at March 31, 2018 | 82,492,008 |
Schedule of Net Income Allocation By Partners | The calculation of net income allocated to the partners is as follows (in millions, except per unit amounts):
|  | For the Three Months Ended March 31,
|  | 2018 |  | 2017
Attributable to Common Units |  |  |  |
Distributions (a) |  | $ | 68 |  |  | $ | 82 |
Distributions in excess of net income |  | (404 | ) |  | (104 | )
Limited partners' interest in net income (loss) |  | $ | (336 | ) |  | $ | (22 | )
(a) Distributions declared per unit to unitholders as of record date |  | $ | 0.8255 |  |  | $ | 0.8255 |
Schedule of Incentive Distribution Rights to Limited Partners | The following table illustrates the percentage allocations of available cash from operating surplus between our common unitholders and the holder of our incentive distribution rights (“IDRs”) based on the specified target distribution levels, after the payment of distributions to Class C unitholders. The amounts set forth under “marginal percentage interest in distributions” are the percentage interests of our IDR holder and the common unitholders in any available cash from operating surplus we distribute up to and including the corresponding amount in the column “total quarterly distribution per unit target amount.” The percentage interests shown for our common unitholders and our IDR holder for the minimum quarterly distribution are also applicable to quarterly distribution amounts that are less than the minimum quarterly distribution.
|  |  | Marginal percentage interest in distributions
| Total quarterly distribution per Common Unit target amount |  | Common Unitholders |  | Holder of IDRs
Minimum Quarterly Distribution | $0.4375 |  | 100 | % |  | — |
First Target Distribution | Above $0.4375 up to $0.503125 |  | 100 | % |  | — |
Second Target Distribution | Above $0.503125 up to $0.546875 |  | 85 | % |  | 15 | %
Third Target Distribution | Above $0.546875 up to $0.656250 |  | 75 | % |  | 25 | %
Thereafter | Above $0.656250 |  | 50 | % |  | 50 | %
Distributions Made to Limited Partner, by Distribution | ash distributions paid or payable during 2018 were as follows:
|  | Limited Partners |  |
Payment Date |  | Per Unit Distribution |  | Total Cash Distribution |  | Distribution to IDR Holders
|  | (in millions, except per unit amounts)
May 15, 2018 |  | $ | 0.8255 |  |  | $ | 68 |  |  | $ | 18 |
February 14, 2018 |  | $ | 0.8255 |  |  | $ | 82 |  |  | $ | 21 |

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