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Equity (Cash Distributions Applicable to Period the Distributions Were Earned) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Class of Stock [Line Items]      
General partner's distributions on general partner units $ 0 $ 25 $ 18
General partner's distributions on IDRs 0 303 187
Total distribution on general partner units and IDRs 0 328 205
Total cash distributions declared 2,060 1,288 938
Limited Partners Common Units      
Class of Stock [Line Items]      
Limited partners' distributions 1,985 895 692
Preferred Units      
Class of Stock [Line Items]      
Limited partners' distributions $ 75 $ 65 $ 41