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CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL - USD ($)
$ in Millions
Total
Partners' Capital Excluding Noncontrolling Interests
Noncontrolling Interests
General Partner
Partners' Capital Excluding Noncontrolling Interests
Series A Preferred Units
Limited Partners
Partners' Capital Excluding Noncontrolling Interests
Common Units
Limited Partners
Partners' Capital Excluding Noncontrolling Interests
Balance, beginning of period at Dec. 31, 2013 $ 7,703 $ 7,644 $ 59 $ 295   $ 7,349
Increase (Decrease) in Partners' Capital            
Net income 1,386 1,384 2 500   884
Cash distributions to partners (1,410) (1,407) (3) (473)   (934)
Sale of common units 866 866   18   848
Other comprehensive income (loss) (370) (370)   (8)   (362)
Other 16 16   8   8
Balance, end of period at Dec. 31, 2014 8,191 8,133 58 340   7,793
Increase (Decrease) in Partners' Capital            
Net income 906 903 3 589   314
Cash distributions to partners (1,674) (1,671) (3) (590)   (1,081)
Sale of common units 1,121 1,121   22   1,099
Other comprehensive income (loss) (614) (614)   (12)   (602)
Other 9 9   (48)   57
Balance, end of period at Dec. 31, 2015 7,939 7,881 58 301   7,580
Increase (Decrease) in Partners' Capital            
Net income 730 726 4 393   333
Cash distributions to partners (1,631) (1,627) (4) (565)   (1,062)
Sale of Series A preferred units 1,542 1,542   33 $ 1,509  
Sale of common units 805 805   9   796
Other comprehensive income (loss) 72 72       72
Simplification Transactions (Note 1) (642) (642)   (171)   (471)
Other 1 2 (1)   (1) 3
Balance, end of period at Dec. 31, 2016 $ 8,816 $ 8,759 $ 57 $ 0 $ 1,508 $ 7,251