Equity and Distributions, Summary of Changes in Outstanding Units (Details)	9 Months Ended
	Sep. 30, 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)	76,113,492
Common units issued in connection with DRIP and EUPP (in units)	13,334,558
Common units issued in connection with the vesting of phantom unit awards (in units)	1,149,450
Common units issued in connection with the vesting of restricted common unit awards (in units)	1,214,178
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)	(403,229)
Other (in units)	90,707
Ending Balance (in units)	2,102,091,660
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)	(1,214,178)
Forfeiture of restricted common unit awards (in units)	(41,774)
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)	704,568
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)	76,113,492
Common units issued in connection with DRIP and EUPP (in units)	13,334,558
Common units issued in connection with the vesting of phantom unit awards (in units)	1,149,450
Common units issued in connection with the vesting of restricted common unit awards (in units)	0
Forfeiture of restricted common unit awards (in units)	(41,774)
Acquisition and cancellation of treasury units in connection with the vesting of equity-based awards (in units)	(403,229)
Other (in units)	90,707
Ending Balance (in units)	2,102,796,228