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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
Series B Preferred Units
Limited Partners
Partners’ Capital Excluding Noncontrolling Interests
Common Units
Common Units
Limited Partners
Partners’ Capital Excluding Noncontrolling Interests
Balance, beginning of period at Dec. 31, 2014 $ 8,191 $ 8,133 $ 58 $ 340 $ 0 $ 0   $ 7,793
Increase (Decrease) in Partners' Capital [Roll Forward]                
Net income 906 903 3 589       314
Distributions (Note 11) (1,674) (1,671) (3) (590)       (1,081)
Sales of common units 1,121 1,121   22     $ 1,121 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 0 0   7,580
Increase (Decrease) in Partners' Capital [Roll Forward]                
Net income 730 726 4 393       333
Distributions (Note 11) (1,631) (1,627) (4) (565)       (1,062)
Sale of Series A preferred units 1,542 1,542   33 1,509      
Sales of common units 805 805   9       796
Other comprehensive income/(loss) 72 72   0       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 0   7,251
Increase (Decrease) in Partners' Capital [Roll Forward]                
Net income 858 856 2 0   11   845
Distributions (Note 11) (1,399) (1,397) (2) 0   (11)   (1,386)
Sale of Series B preferred units 788 788       788    
Sales of common units 1,664 1,664   0     $ 1,664 1,664
Acquisition of interest in Advantage Joint Venture (Note 6) 40 40           40
Sale of interest in SLC Pipeline LLC (Note 6) (57)   (57)          
Other comprehensive income/(loss) 239 239           239
Other 9 9 0   (3)     12
Balance, end of period at Dec. 31, 2017 $ 10,958 $ 10,958 $ 0 $ 0 $ 1,505 $ 788   $ 8,665