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Equity - Cash Distributions (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Apr. 25, 2018
Mar. 31, 2018
Mar. 31, 2017
Incentive Distribution Made to Managing Member or General Partner [Line Items]      
Distributions declared (including IDRs)   $ 483 $ 279
General partner's distributions   0 5
General partner's incentive distribution rights   0 60
Total general partner's distributions   0 65
Partners' distributions   483 279
Limited Partners Common Units      
Incentive Distribution Made to Managing Member or General Partner [Line Items]      
Partners' distributions   467 198
Preferred Units      
Incentive Distribution Made to Managing Member or General Partner [Line Items]      
Partners' distributions   $ 16 $ 16
Subsequent Event      
Incentive Distribution Made to Managing Member or General Partner [Line Items]      
Declaration date Apr. 25, 2018    
Distributions declared (including IDRs) $ 467    
Cash distributions declared per limited partner common unit $ 0.6175    
Distribution date May 15, 2018    
Date of record May 07, 2018