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Equity and Distributions, Summary of Changes in Outstanding Units (Details)
 9 Months Ended
Sep. 30, 2017
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Common Units (Unrestricted) [Member]  
Summary of changes in outstanding units [Roll Forward]  
Beginning Balance (in units) 2,116,906,120
Common units issued in connection with ATM program (in units) 21,807,726
Common units issued in connection with DRIP and EUPP (in units) 10,710,589
Common units issued in connection with the vesting of phantom unit awards (in units) 2,413,070
Common units issued in connection with the vesting of restricted common unit awards (in units) 679,370
Forfeiture of restricted common unit awards (in units) 0
Cancellation of treasury units acquired in connection with the vesting of equity-based awards (in units) (1,006,715)
Common units issued in connection with employee compensation (in units) 1,176,103
Other (in units) 14,685
Ending Balance (in units) 2,152,700,948
Restricted Common Units [Member]  
Summary of changes in outstanding units [Roll Forward]  
Beginning Balance (in units) 682,294
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) (679,370)
Forfeiture of restricted common unit awards (in units) (1,250)
Cancellation of treasury units acquired in connection with the vesting of equity-based awards (in units) 0
Common units issued in connection with employee compensation (in units) 0
Other (in units) 0
Ending Balance (in units) 1,674
Common Units [Member]  
Summary of changes in outstanding units [Roll Forward]  
Beginning Balance (in units) 2,117,588,414
Common units issued in connection with ATM program (in units) 21,807,726
Common units issued in connection with DRIP and EUPP (in units) 10,710,589
Common units issued in connection with the vesting of phantom unit awards (in units) 2,413,070
Common units issued in connection with the vesting of restricted common unit awards (in units) 0
Forfeiture of restricted common unit awards (in units) (1,250)
Cancellation of treasury units acquired in connection with the vesting of equity-based awards (in units) (1,006,715)
Common units issued in connection with employee compensation (in units) 1,176,103
Other (in units) 14,685
Ending Balance (in units) 2,152,702,622