Equity and Distributions, Summary of Changes in Outstanding Units (Details)	3 Months Ended
	Mar. 31, 2016 shares
Common Units (Unrestricted) [Member]
Summary of changes in outstanding units [Roll Forward]
Beginning Balance (in units)	2,010,592,504
Common units issued in connection with ATM program (in units)	35,396,147
Common units issued in connection with DRIP and EUPP (in units)	7,282,006
Common units issued in connection with the vesting of phantom unit awards (in units)	1,053,117
Common units issued in connection with the vesting of restricted common unit awards (in units)	1,167,578
Forfeiture of restricted common unit awards (in units)	0
Acquisition and cancellation of treasury units in connection with the vesting of equity-based awards (in units)	(388,396)
Other (in units)	20,630
Ending Balance (in units)	2,055,123,586
Restricted Common Units [Member]
Summary of changes in outstanding units [Roll Forward]
Beginning Balance (in units)	1,960,520
Common units issued in connection with ATM program (in units)	0
Common units issued in connection with DRIP and EUPP (in units)	0
Common units issued in connection with the vesting of phantom unit awards (in units)	0
Common units issued in connection with the vesting of restricted common unit awards (in units)	(1,167,578)
Forfeiture of restricted common unit awards (in units)	(9,350)
Acquisition and cancellation of treasury units in connection with the vesting of equity-based awards (in units)	0
Other (in units)	0
Ending Balance (in units)	783,592
Common units [Member]
Summary of changes in outstanding units [Roll Forward]
Beginning Balance (in units)	2,012,553,024
Common units issued in connection with ATM program (in units)	35,396,147
Common units issued in connection with DRIP and EUPP (in units)	7,282,006
Common units issued in connection with the vesting of phantom unit awards (in units)	1,053,117
Common units issued in connection with the vesting of restricted common unit awards (in units)	0
Forfeiture of restricted common unit awards (in units)	(9,350)
Acquisition and cancellation of treasury units in connection with the vesting of equity-based awards (in units)	(388,396)
Other (in units)	20,630
Ending Balance (in units)	2,055,907,178