CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL - USD ($) $ in Millions	Total	Partners' Capital (Excluding Noncontrolling Interests) Class A Shares	Noncontrolling Interests
Balance, beginning of period at Dec. 31, 2013	$ 8,279	$ 1,035	$ 7,244
Increase (Decrease) in Partners' Capital
Net income	1,328	70	1,258
Cash distributions to partners	(1,396)	(91)	(1,305)
Deferred tax asset (Note 13)	675	675
Change in ownership interest in connection with Exchange Right exercises (Note 11)		(31)	31
Sale of common units by a subsidiary	848		848
Other comprehensive income/(loss)	(370)	(2)	(368)
Other	17	1	16
Balance, end of period at Dec. 31, 2014	9,381	1,657	7,724
Increase (Decrease) in Partners' Capital
Net income	809	118	691
Cash distributions to partners	(1,660)	(195)	(1,465)
Deferred tax asset (Note 13)	205	205
Change in ownership interest in connection with Exchange Right exercises (Note 11)		(6)	6
Sale of common units by a subsidiary	1,099		1,099
Other comprehensive income/(loss)	(614)	(5)	(609)
Other	14	(12)	26
Balance, end of period at Dec. 31, 2015	9,234	1,762	7,472
Increase (Decrease) in Partners' Capital
Net income	660	94	566
Cash distributions to partners	(1,653)	(234)	(1,419)
Deferred tax asset (Note 13)	92	92
Change in ownership interest in connection with Exchange Right exercises (Note 11)		(18)	18
Sale of Series A preferred units by a subsidiary	1,509		1,509
Sale of common units by a subsidiary	796	37	759
Other comprehensive income/(loss)	72	20	52
Other	(3)	(16)	13
Balance, end of period at Dec. 31, 2016	$ 10,707	$ 1,737	$ 8,970