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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
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Investments in Unconsolidated Entities                  
Investments in unconsolidated entities           $ 3,805 $ 3,764 $ 3,683  
Capital contributions to equity method investees excluding capitalized interest           82 445 504  
Capitalized interest related to contributions to unconsolidated entities           18 24 34  
Amount by which investments in unconsolidated entities exceeded our share of the underlying equity in the net assets           223 170    
Equity Method Investees                  
Investments in Unconsolidated Entities                  
Capitalized interest related to contributions to unconsolidated entities           $ 12 $ 16 20  
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        
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%      
Investments in unconsolidated entities           $ 406 $ 421    
Cactus II Pipeline LLC (“Cactus II”)                  
Investments in Unconsolidated Entities                  
Ownership interest in unconsolidated entity           65.00%      
Investments in unconsolidated entities           $ 737 752    
Capline Pipeline Company LLC                  
Investments in Unconsolidated Entities                  
Ownership interest in unconsolidated entity           54.00%      
Investments in unconsolidated entities           $ 531 514    
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               $ 269  
Diamond Pipeline LLC (“Diamond”)                  
Investments in Unconsolidated Entities                  
Ownership interest in unconsolidated entity           50.00%      
Investments in unconsolidated entities           $ 464 480    
Eagle Ford Pipeline LLC (“Eagle Ford Pipeline”)                  
Investments in Unconsolidated Entities                  
Ownership interest in unconsolidated entity           50.00%      
Investments in unconsolidated entities           $ 363 372    
Eagle Ford Terminals Corpus Christi LLC (“Eagle Ford Terminals”)                  
Investments in Unconsolidated Entities                  
Ownership interest in unconsolidated entity           50.00%      
Investments in unconsolidated entities           $ 120 122    
OMOG JV LLC                  
Investments in Unconsolidated Entities                  
Ownership interest in unconsolidated entity           40.00%      
Investments in unconsolidated entities           $ 102      
Saddlehorn                  
Investments in Unconsolidated Entities                  
Ownership interest in unconsolidated entity 30.00%         30.00%      
Investments in unconsolidated entities           $ 209 $ 208    
Ownership percentage sold 10.00%           10.00%    
Proceeds from sale of interest in unconsolidated entity $ 78           $ 78    
Saddlehorn | Gain on/(impairment of) investments in unconsolidated entities, net                  
Investments in Unconsolidated Entities                  
Gain on sale of investment in unconsolidated entities $ 21                
White Cliffs Pipeline, LLC                  
Investments in Unconsolidated Entities                  
Ownership interest in unconsolidated entity           36.00%      
Investments in unconsolidated entities           $ 171 192    
Wink to Webster Pipeline LLC (“W2W Pipeline”)                  
Investments in Unconsolidated Entities                  
Ownership interest in unconsolidated entity           16.00%      
Investments in unconsolidated entities           $ 345 330    
Other investments                  
Investments in Unconsolidated Entities                  
Investments in unconsolidated entities           $ 357 $ 373    
Write down of investments       $ 43          
STACK Pipeline LLC (“STACK”)                  
Investments in Unconsolidated Entities                  
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%              
Red Oak Pipeline LLC (“Red Oak”)                  
Investments in Unconsolidated Entities                  
Ownership interest in unconsolidated entity                 50.00%
Write down of investments     $ 69