Consolidated Statement of Changes in Equity (Unaudited) - 9 months ended Sep. 30, 2016 - USD ($) $ in Millions	Total	General Partner [Member]	Common Units Limited Partners	Class B Units Limited Partners	Total Partners' Equity	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]
Beginning balance at Dec. 31, 2015	$ 24,606	$ 2,552	$ 19,730	$ 771	$ 22,881	$ (172)	$ 1,725
Net income (loss)	353	422	(132)	(4)	286	0	67
Other comprehensive income (loss)	171	0	0	0	171	171	0
Noncash Consideration Related To Assets Contributed To Partnership (Note 2)	(150)	(150)	0	0	(150)	0	0
Partners' Capital Account, Sale of Units (Note 9)	250	0	250	0	250	0	0
Cash distributions	(1,956)	(455)	(1,501)	0	(1,956)	0	0
Contributions from general partner	14	14	0	0	14	0	0
Contributions from noncontrolling interests	(27)	0	0	0	0	0	(27)
Distributions to noncontrolling interests	(69)	0	0	0	0	0	(69)
Other	7	0	7	0	7	0	0
Net increase (decrease) in equity	(1,353)	(169)	(1,376)	(4)	(1,378)	171	25
Ending balance at Sep. 30, 2016	$ 23,253	$ 2,383	$ 18,354	$ 767	$ 21,503	$ (1)	$ 1,750