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Investments in Unconsolidated Entities - Equity Method Investments (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 29, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Mar. 31, 2019
Jun. 30, 2018
Sep. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Investments in Unconsolidated Entities                    
Investments in unconsolidated entities               $ 3,764 $ 3,683 $ 2,702
Carrying value of undivided joint interest               14,620 15,367  
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  
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%    
Gain on/(impairment of) investments in unconsolidated entities, net                    
Investments in Unconsolidated Entities                    
Write down of investments   $ 91 $ 69 $ 43            
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 equity method investment             $ 868     $ 868
Ownership percentage sold             30.00%     30.00%
Gain on sale of investment in unconsolidated entities             $ 200     $ 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 equity method investment           $ 26        
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 equity method investment $ 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%  
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%          
Oxy | Cactus II Pipeline LLC (“Cactus II”)                    
Investments in Unconsolidated Entities                    
Interest acquired           20.00%        
Third Party | Cactus II Pipeline LLC (“Cactus II”)                    
Investments in Unconsolidated Entities                    
Interest acquired           15.00%        
Other long-term liabilities and deferred credits | Cactus II Pipeline LLC (“Cactus II”)                    
Investments in Unconsolidated Entities                    
Advance cash payment, pipeline capacity agreements           $ 100        
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%