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Intangible Assets and Goodwill (Tables)
 3 Months Ended
Mar. 31, 2024
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, 2024
    
December 31, 2023
  
 
  
Gross
Value
    
Accumulated
Amortization
    
Carrying
Value
    
Gross
Value
    
Accumulated
Amortization
    
Carrying
Value
  
NGL Pipelines & Services:
                                    
Customer relationship intangibles
  
$
449
    
$
(267
)
  
$
182
    
$
449
    
$
(263
)
  
$
186
  
Contract-based intangibles
    
752
      
(116
)
    
636
      
752
      
(110
)
    
642
  
Segment total
    
1,201
      
(383
)
    
818
      
1,201
      
(373
)
    
828
  
Crude Oil Pipelines & Services:
                                                
Customer relationship intangibles
    
2,195
      
(555
)
    
1,640
      
2,195
      
(530
)
    
1,665
  
Contract-based intangibles
    
283
      
(275
)
    
8
      
283
      
(275
)
    
8
  
Segment total
    
2,478
      
(830
)
    
1,648
      
2,478
      
(805
)
    
1,673
  
Natural Gas Pipelines & Services:
                                                
Customer relationship intangibles
    
1,351
      
(634
)
    
717
      
1,351
      
(625
)
    
726
  
Contract-based intangibles
    
641
      
(213
)
    
428
      
641
      
(209
)
    
432
  
Segment total
    
1,992
      
(847
)
    
1,145
      
1,992
      
(834
)
    
1,158
  
Petrochemical & Refined Products Services:
                                                
Customer relationship intangibles
    
181
      
(87
)
    
94
      
181
      
(86
)
    
95
  
Contract-based intangibles
    
45
      
(30
)
    
15
      
45
      
(29
)
    
16
  
Segment total
    
226
      
(117
)
    
109
      
226
      
(115
)
    
111
  
Total intangible assets
  
$
5,897
    
$
(2,177
)
  
$
3,720
    
$
5,897
    
$
(2,127
)
  
$
3,770
  
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,
  
 
  
2024
    
2023
  
NGL Pipelines & Services
  
$
10
    
$
9
  
Crude Oil Pipelines & Services
    
25
      
23
  
Natural Gas Pipelines & Services
    
13
      
12
  
Petrochemical & Refined Products Services
    
2
      
2
  
Total
  
$
50
    
$
46
  
Forecasted Amortization Expense
The following table presents our forecast of amortization expense associated with existing intangible assets for the periods indicated:

Remainder
of 2024
    
2025
    
2026
    
2027
    
2028
  
$
160
    
$
208
    
$
203
    
$
185
    
$
180