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Intangible Assets and Goodwill (Tables)
 3 Months Ended
Mar. 31, 2023
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, 2023
    
December 31, 2022
  
 
  
Gross
Value
    
Accumulated
Amortization
    
Carrying
Value
    
Gross
Value
    
Accumulated
Amortization
    
Carrying
Value
  
NGL Pipelines & Services:
                                    
Customer relationship intangibles
  
$
449
    
$
(253
)
  
$
196
    
$
449
    
$
(249
)
  
$
200
  
Contract-based intangibles
    
749
      
(89
)
    
660
      
749
      
(84
)
    
665
  
Segment total
    
1,198
      
(342
)
    
856
      
1,198
      
(333
)
    
865
  
Crude Oil Pipelines & Services:
                                                
Customer relationship intangibles
    
2,195
      
(453
)
    
1,742
      
2,195
      
(431
)
    
1,764
  
Contract-based intangibles
    
283
      
(272
)
    
11
      
283
      
(271
)
    
12
  
Segment total
    
2,478
      
(725
)
    
1,753
      
2,478
      
(702
)
    
1,776
  
Natural Gas Pipelines & Services:
                                                
Customer relationship intangibles
    
1,350
      
(596
)
    
754
      
1,350
      
(588
)
    
762
  
Contract-based intangibles
    
639
      
(199
)
    
440
      
639
      
(195
)
    
444
  
Segment total
    
1,989
      
(795
)
    
1,194
      
1,989
      
(783
)
    
1,206
  
Petrochemical & Refined Products Services:
                                                
Customer relationship intangibles
    
181
      
(82
)
    
99
      
181
      
(80
)
    
101
  
Contract-based intangibles
    
45
      
(28
)
    
17
      
45
      
(28
)
    
17
  
Segment total
    
226
      
(110
)
    
116
      
226
      
(108
)
    
118
  
Total intangible assets
  
$
5,891
    
$
(1,972
)
  
$
3,919
    
$
5,891
    
$
(1,926
)
  
$
3,965
  
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,
  
 
  
2023
    
2022
  
NGL Pipelines & Services
  
$
9
    
$
8
  
Crude Oil Pipelines & Services
    
23
      
20
  
Natural Gas Pipelines & Services
    
12
      
11
  
Petrochemical & Refined Products Services
    
2
      
2
  
Total
  
$
46
    
$
41
  
Forecasted Amortization Expense
The following table presents our forecast of amortization expense associated with existing intangible assets for the periods indicated:

Remainder
of 2023
    
2024
    
2025
    
2026
    
2027
  
$
154
    
$
222
    
$
230
    
$
237
    
$
235