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Supplemental Financial Statement Information Supplemental Financial Information (Balance Sheet Units) (Details) - shares
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]        
Authorized 2,619,368,605 1,079,145,561    
Issued 2,619,368,605 1,079,145,561    
Outstanding 2,619,368,605 1,079,145,561 1,046,900,000 1,044,800,000
Preferred Units, Authorized 0 329,299,267    
Preferred Units, Issued 0 329,299,267    
Preferred Units, Outstanding 0 329,299,267