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Supplemental Financial Statement Information Supplemental Financial Information (Balance Sheet Units) (Details) - shares
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Authorized 1,079,145,561 1,046,947,157      
Issued 1,079,145,561 1,046,947,157      
Outstanding 1,079,145,561 1,046,947,157 1,044,800,000 1,077,500,000  
Preferred Units, Authorized 329,299,267 329,299,267      
Preferred Units, Issued 329,299,267 329,299,267      
Preferred Units, Outstanding 329,299,267 329,299,267      
Class D Units [Member]          
Outstanding         3,080,000