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Investments in Unconsolidated Entities - Equity Method Investments (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 29, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Mar. 31, 2019
Jun. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Sep. 30, 2018
Investments in Unconsolidated Entities                      
Investments in unconsolidated entities             $ 3,764 $ 3,683 $ 2,702    
Carrying value of undivided joint interest             14,611 15,355      
Advance cash payment, pipeline capacity agreements             501 354 338    
Capital contributions to equity method investees excluding capitalized interest             445 504 459    
Capitalized interest related to contributions to unconsolidated entities             24 34 30    
Amount by which investments in unconsolidated entities exceeded our share of the underlying equity in the net assets             170 349      
Gain on/(impairment of) investments in unconsolidated entities, net                      
Investments in Unconsolidated Entities                      
Write down of investments   $ 91 $ 69 $ 43              
Equity Method Investees                      
Investments in Unconsolidated Entities                      
Capitalized interest related to contributions to unconsolidated entities             $ 16 $ 20 9    
Capline Pipeline Company LLC | Capline pipeline system                      
Investments in Unconsolidated Entities                      
Percentage of Capline pipeline system owned         100.00%            
Undivided joint interest in Capline pipeline system                      
Investments in Unconsolidated Entities                      
Undivided joint interest ownership percentage         54.00%            
Carrying value of undivided joint interest         $ 175            
Undivided joint interest in pipeline segment | Wink to Webster Pipeline LLC (“W2W Pipeline”) | Midland, Texas to Webster, Texas pipeline segment                      
Investments in Unconsolidated Entities                      
Undivided joint interest ownership percentage               71.00%      
Undivided joint interest in pipeline segment | Enterprise Products Partners, L.P. | Midland, Texas to Webster, Texas pipeline segment                      
Investments in Unconsolidated Entities                      
Undivided joint interest ownership percentage               29.00%      
Level 3 | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow                      
Investments in Unconsolidated Entities                      
Discount rate, asset impairment analysis, cost of capital, theoretical market participant             14.00%        
BridgeTex Pipeline Company, LLC (“BridgeTex”)                      
Investments in Unconsolidated Entities                      
Ownership interest in unconsolidated entity             20.00%       20.00%
Investments in unconsolidated entities             $ 421 $ 431      
Proceeds from sale of interest in unconsolidated entity                 $ 868    
Ownership percentage sold                 30.00%   30.00%
Gain on sale of investment in unconsolidated entities                 $ 200    
Cactus II Pipeline LLC (“Cactus II”)                      
Investments in Unconsolidated Entities                      
Ownership interest in unconsolidated entity             65.00%        
Investments in unconsolidated entities             $ 752 738      
Reduction of property and equipment from deconsolidation           $ 74          
Proceeds from sale of interest in unconsolidated entity           $ 26          
Cactus II Pipeline LLC (“Cactus II”) | Oxy                      
Investments in Unconsolidated Entities                      
Interest acquired           20.00%          
Cactus II Pipeline LLC (“Cactus II”) | Third Party                      
Investments in Unconsolidated Entities                      
Interest acquired           15.00%          
Cactus II Pipeline LLC (“Cactus II”) | Other long-term liabilities and deferred credits                      
Investments in Unconsolidated Entities                      
Advance cash payment, pipeline capacity agreements           $ 100          
Capline Pipeline Company LLC                      
Investments in Unconsolidated Entities                      
Ownership interest in unconsolidated entity             54.00%        
Investments in unconsolidated entities             $ 514 484      
Fair value of investment in unconsolidated entity         $ 444            
Capline Pipeline Company LLC | Gain on/(impairment of) investments in unconsolidated entities, net                      
Investments in Unconsolidated Entities                      
Gain from remeasurement to fair value of retained investment   2   267       269      
Diamond Pipeline LLC (“Diamond”)                      
Investments in Unconsolidated Entities                      
Ownership interest in unconsolidated entity             50.00%        
Investments in unconsolidated entities             $ 480 476      
Eagle Ford Pipeline LLC (“Eagle Ford Pipeline”)                      
Investments in Unconsolidated Entities                      
Ownership interest in unconsolidated entity             50.00%        
Investments in unconsolidated entities             $ 372 382      
Eagle Ford Terminals Corpus Christi LLC (“Eagle Ford Terminals”)                      
Investments in Unconsolidated Entities                      
Ownership interest in unconsolidated entity             50.00%        
Investments in unconsolidated entities             $ 122 126      
Red Oak Pipeline LLC (“Red Oak”)                      
Investments in Unconsolidated Entities                      
Ownership interest in unconsolidated entity             50.00%     50.00%  
Investments in unconsolidated entities             $ 35 20      
Write down of investments     $ 69                
Saddlehorn                      
Investments in Unconsolidated Entities                      
Ownership interest in unconsolidated entity 30.00%           30.00%        
Investments in unconsolidated entities             $ 208 234      
Proceeds from sale of interest in unconsolidated entity $ 78           $ 78        
Ownership percentage sold 10.00%           10.00%        
Saddlehorn | Gain on/(impairment of) investments in unconsolidated entities, net                      
Investments in Unconsolidated Entities                      
Gain on sale of investment in unconsolidated entities $ 21                    
STACK Pipeline LLC (“STACK”)                      
Investments in Unconsolidated Entities                      
Ownership interest in unconsolidated entity             50.00%        
Investments in unconsolidated entities             $ 22 117      
Write down of investments   $ 91                  
STACK Pipeline LLC (“STACK”) | Level 3 | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow                      
Investments in Unconsolidated Entities                      
Discount rate, asset impairment analysis, cost of capital, theoretical market participant             14.00%        
White Cliffs Pipeline, LLC                      
Investments in Unconsolidated Entities                      
Ownership interest in unconsolidated entity             36.00%        
Investments in unconsolidated entities             $ 192 $ 196      
Wink to Webster Pipeline LLC (“W2W Pipeline”)                      
Investments in Unconsolidated Entities                      
Ownership interest in unconsolidated entity             16.00% 16.00%      
Investments in unconsolidated entities             $ 330 $ 136      
Other investments                      
Investments in Unconsolidated Entities                      
Investments in unconsolidated entities             $ 316 $ 343      
Write down of investments       $ 43              
Cushing Connect Pipeline & Terminal LLC                      
Investments in Unconsolidated Entities                      
Ownership interest in unconsolidated entity               50.00%