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Acquisitions and Divestitures - Divestitures (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2020
Sep. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Divestitures          
Proceeds from sales of assets     $ 77 $ 1,334 $ 1,083
Disposed of by sale          
Divestitures          
Proceeds from sales of assets     77    
Disposed of by sale | (Gains)/losses on asset sales and asset impairments, net          
Divestitures          
Recognized gains/(losses) related to sale of assets, net     16 120 43
Recognized gains related to sale of assets     31 146 123
Recognized losses related to sale of assets     $ 47 26 $ 80
Red River Pipeline          
Divestitures          
Ownership interest disposed of         40.00%
Los Angeles Basin Crude Oil Terminals | Disposed of by sale | Subsequent Event          
Divestitures          
Proceeds from sales of assets $ 195        
Recognized gains/(losses) related to sale of assets, net $ 160        
BridgeTex Pipeline Company, LLC (“BridgeTex”)          
Divestitures          
Ownership percentage sold   30.00%      
Proceeds from sale of equity method investment   $ 868      
Gain on sale of investment in unconsolidated entities       $ 200