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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL - USD ($) $ in Millions | Limited Partners Series A Preferred Units Partners' Capital Excluding Noncontrolling Interests | Limited Partners Common Units Partners' Capital Excluding Noncontrolling Interests | General Partner Partners' Capital Excluding Noncontrolling Interests | Partners' Capital Excluding Noncontrolling Interests | Noncontrolling Interests | Total
--- | --- | --- | --- | --- | --- | ---
Balance, beginning of period at Dec. 31, 2014 |  | $ 7,793 | $ 340 | $ 8,133 | $ 58 | $ 8,191
Increase (Decrease) in Partners' Capital |  |  |  |  |  |
Net income |  | 116 | 291 | 407 | 1 | 408
Cash distributions to partners |  | (526) | (284) | (810) | (1) | (811)
Sale of common units |  | 1,099 | 22 | 1,121 |  | 1,121
Other comprehensive income/(loss) |  | (202) | (4) | (206) |  | (206)
Other |  |  | 2 | 2 |  | 2
Balance, end of period at Jun. 30, 2015 |  | 8,280 | 367 | 8,647 | 58 | 8,705
Balance, beginning of period at Dec. 31, 2015 |  | 7,580 | 301 | 7,881 | 58 | 7,939
Increase (Decrease) in Partners' Capital |  |  |  |  |  |
Net income |  | 11 | 291 | 302 | 2 | 304
Cash distributions to partners |  | (557) | (309) | (866) | (2) | (868)
Sale of Series A preferred units | $ 1,509 |  | 33 | 1,542 |  | 1,542
Other comprehensive income/(loss) |  | 44 | 1 | 45 |  | 45
Other |  | 7 | 1 | 8 |  | 8
Balance, end of period at Jun. 30, 2016 | $ 1,509 | $ 7,085 | $ 318 | $ 8,912 | $ 58 | $ 8,970

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