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Intangible Assets and Goodwill (Tables)
 3 Months Ended
Mar. 31, 2025
Intangible Assets and Goodwill [Abstract]  
Intangible Assets by Segment
The following table summarizes our intangible assets by business segment at the dates indicated:

   
March 31, 2025
    
December 31, 2024
  
 
  
Gross
Value
    
Accumulated
Amortization
    
Carrying
Value
    
Gross
Value
    
Accumulated
Amortization
    
Carrying
Value
  
NGL Pipelines & Services:
                                    
Customer relationship intangibles
  
$
449
    
$
(279
)
  
$
170
    
$
449
    
$
(276
)
  
$
173
  
Contract-based intangibles
    
754
      
(149
)
    
605
      
754
      
(141
)
    
613
  
Segment total
    
1,203
      
(428
)
    
775
      
1,203
      
(417
)
    
786
  
Crude Oil Pipelines & Services:
                                                
Customer relationship intangibles
    
2,195
      
(648
)
    
1,547
      
2,195
      
(627
)
    
1,568
  
Contract-based intangibles
    
283
      
(278
)
    
5
      
283
      
(278
)
    
5
  
Segment total
    
2,478
      
(926
)
    
1,552
      
2,478
      
(905
)
    
1,573
  
Natural Gas Pipelines & Services:
                                                
Customer relationship intangibles
    
1,351
      
(673
)
    
678
      
1,351
      
(663
)
    
688
  
Contract-based intangibles
    
1,081
      
(235
)
    
846
      
1,081
      
(227
)
    
854
  
Segment total
    
2,432
      
(908
)
    
1,524
      
2,432
      
(890
)
    
1,542
  
Petrochemical & Refined Products Services:
                                                
Customer relationship intangibles
    
181
      
(94
)
    
87
      
181
      
(92
)
    
89
  
Contract-based intangibles
    
45
      
(30
)
    
15
      
45
      
(30
)
    
15
  
Segment total
    
226
      
(124
)
    
102
      
226
      
(122
)
    
104
  
Total intangible assets
  
$
6,339
    
$
(2,386
)
  
$
3,953
    
$
6,339
    
$
(2,334
)
  
$
4,005
  
Amortization Expense of Intangible Assets by Segment
The following table presents the amortization expense of our intangible assets by business segment for the periods indicated:

 
  
For the Three Months
Ended March 31,
  
 
  
2025
    
2024
  
NGL Pipelines & Services
  
$
11
    
$
10
  
Crude Oil Pipelines & Services
    
21
      
25
  
Natural Gas Pipelines & Services
    
18
      
13
  
Petrochemical & Refined Products Services
    
2
      
2
  
Total
  
$
52
    
$
50
  
Forecasted Amortization Expense
The following table presents our forecast of amortization expense associated with existing intangible assets for the periods indicated:

Remainder
of 2025
    
2026
    
2027
    
2028
    
2029
  
$
165
    
$
215
    
$
209
    
$
198
    
$
199