Equity and Distributions, Summary of Changes in Outstanding Units (Details)	9 Months Ended
	Sep. 30, 2014
Common Units (Unrestricted) [Member]
Summary of changes in outstanding units [Roll Forward]
Beginning Balance (in units)	1,864,148,802
Common units issued in connection with at-the-market program (in units)	1,590,334
Common units issued in connection with DRIP and EUPP (in units)	7,355,904
Common units issued in connection with the vesting and exercise of unit options (in units)	1,014,108
Common units issued in connection with the vesting of phantom unit awards (in units)	20,842
Common units issued in connection with the vesting of restricted common unit awards (in units)	2,586,398
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)	(878,017)
Other (in units)	17,202
Ending Balance (in units)	1,875,855,573
Restricted Common Units [Member]
Summary of changes in outstanding units [Roll Forward]
Beginning Balance (in units)	7,221,214
Common units issued in connection with at-the-market program (in units)	0
Common units issued in connection with DRIP and EUPP (in units)	0
Common units issued in connection with the vesting and exercise of unit options (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)	(2,586,398)
Forfeiture of restricted common unit awards (in units)	(267,200)
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)	4,367,616
Common units [Member]
Summary of changes in outstanding units [Roll Forward]
Beginning Balance (in units)	1,871,370,016
Common units issued in connection with at-the-market program (in units)	1,590,334
Common units issued in connection with DRIP and EUPP (in units)	7,355,904
Common units issued in connection with the vesting and exercise of unit options (in units)	1,014,108
Common units issued in connection with the vesting of phantom unit awards (in units)	20,842
Common units issued in connection with the vesting of restricted common unit awards (in units)	0
Forfeiture of restricted common unit awards (in units)	(267,200)
Acquisition and cancellation of treasury units in connection with the vesting of equity-based awards (in units)	(878,017)
Other (in units)	17,202
Ending Balance (in units)	1,880,223,189