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Partners' Capital and Distributions (Tables) | 12 Months Ended
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Dec. 31, 2016
Partners' Capital Notes [Abstract] |
Activity for Series A preferred units and common units | The following table presents the activity for our Series A preferred units and common units:
| Limited Partners
| Preferred Units |  | Common Units
Outstanding at December 31, 2013 | — |  |  | 359,133,200 |
Sale of common units | — |  |  | 15,375,810 |
Issuance of common units under LTIP | — |  |  | 598,783 |
Outstanding at December 31, 2014 | — |  |  | 375,107,793 |
Sale of common units | — |  |  | 22,133,904 |
Issuance of common units under LTIP | — |  |  | 485,927 |
Outstanding at December 31, 2015 | — |  |  | 397,727,624 |
Sale of Series A preferred units | 61,030,127 |  |  | — |
Issuance of Series A preferred units in connection with in-kind distributions | 3,358,726 |  |  | — |
Sale of common units | — |  |  | 26,278,288 |
Issuance of common units under LTIP | — |  |  | 480,581 |
Issuance of common units in connection with Simplification Transactions | — |  |  | 244,707,926 |
Outstanding at December 31, 2016 | 64,388,853 |  |  | 669,194,419 |
Schedule of distributions paid, net of reductions in the general partner's incentive distributions | The following table details distributions paid during the year presented (in millions, except per unit data):
|  | Distributions Paid |  |  | Distributions per common unit
Year |  | Common Unitholders |  | General Partner (1) |  | Total |  |
2016 |  | $ | 1,062 |  |  | $ | 565 |  |  | $ | 1,627 |  |  |  | $ | 2.65 |
2015 |  | $ | 1,081 |  |  | $ | 590 |  |  | $ | 1,671 |  |  |  | $ | 2.76 |
2014 |  | $ | 934 |  |  | $ | 473 |  |  | $ | 1,407 |  |  |  | $ | 2.55 |
(1) | During the years ended December 31, 2016, 2015 and 2014, our general partner’s incentive distributions were reduced by approximately $18 million, $22 million and $23 million, respectively, which were agreed to in connection with certain acquisitions.
Issuance of common units | The following table summarizes our issuance of common units in connection with our Continuous Offering Program and underwritten offerings (net proceeds in millions):
Year |  | Type of Offering |  | Units Issued |  | Net Proceeds (1) (2) |
2016 Total |  | Continuous Offering Program |  | 26,278,288 |  |  | $ | 805 |  | (3)
2015 |  | Continuous Offering Program |  | 1,133,904 |  |  | $ | 59 |  | (3)
2015 |  | Underwritten Offering |  | 21,000,000 |  |  | 1,062 |  |
2015 Total |  |  |  | 22,133,904 |  |  | $ | 1,121 |  |
2014 Total |  | Continuous Offering Program |  | 15,375,810 |  |  | $ | 866 |  | (3)
(1) | Amounts are net of costs associated with the offerings.
(2) | For periods prior to the closing of the Simplification Transactions, amounts include our general partner’s proportionate capital contributions of $9 million, $22 million and $18 million during 2016, 2015 and 2014, respectively.
(3) | We pay commissions to our sales agents in connection with common unit issuances under our Continuous Offering Program. We paid $8 million, $1 million and $9 million of such commissions during 2016, 2015 and 2014, respectively.

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