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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL - USD ($)
$ in Millions
Total
Noncontrolling Interests
Class A Shares
Limited Partners
Class A Shares
Balance, beginning of period at Dec. 31, 2015 $ 9,234 $ 7,472   $ 1,762
Increase (Decrease) in Partners' Capital        
Net income 259 181   78
Cash distributions to partners (860) (743)   (117)
Deferred tax asset (Note 9) 96     96
Change in ownership interest in connection with Exchange Right exercises   16   (16)
Sale of Series A preferred units by a subsidiary 1,509 1,509    
Other comprehensive income 45 45    
Other 6 7   (1)
Balance, end of period at Jun. 30, 2016 10,289 8,487   1,802
Balance, beginning of period at Dec. 31, 2016 10,707 8,970   1,737
Increase (Decrease) in Partners' Capital        
Net income 575 510   65
Cash distributions to partners (771) (630)   (141)
Deferred tax asset (Note 9) 393     393
Sales of Class A shares (Note 9) 1,535 1,073 $ 1,535 462
Sales of common units by a subsidiary (Note 9) 129 116   13
Issuance of common units by a subsidiary for acquisition of interest in Advantage Joint Venture (Note 6) 40 35   5
Other comprehensive income 111 90   21
Other 11 (12)   23
Balance, end of period at Jun. 30, 2017 $ 12,730 $ 10,152   $ 2,578