Income Per Limited Partner Unit Reconciliation of Numerator and Denominator of Basic and Diluted Earnings Per Common Unit (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net income allocated to limited partners	$ 91	$ 33	$ 74	$ 40
Diluted income from continuing operations amount	91	10	74	40
Weighted average number of common units outstanding	397,961,321	209,559,854	328,989,245	191,334,032
Diluted weighted number of units outstanding	398,730,303	212,075,520	329,606,853	191,709,774
Basic income per common unit	$ 0.23	$ 0.16	$ 0.22	$ 0.21
Diluted income per common unit	$ 0.23	$ 0.05	$ 0.22	$ 0.21
Common unit options [Member]
Income allocated to dilutive securities	0	0	0	0
Incremental common shares attributable to options	31,777	32,489	27,574	23,931
Phantom Units [Member]
Income allocated to dilutive securities	0	0	0	0
Incremental common shares attributable to phantom units	737,205	435,606	590,034	351,811
Series A preferred units [Member]
Income allocated to dilutive securities	$ 0	$ (23)
Incremental common shares attributable to dilutive effect of conversion of preferred stock	0	2,047,571