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Intangible Assets and Goodwill (Tables)
 6 Months Ended
Jun. 30, 2023
Intangible Assets and Goodwill [Abstract]  
Intangible Assets by Segment
The following table summarizes our intangible assets by business segment at the dates indicated:

   
June 30, 2023
    
December 31, 2022
  
 
  
Gross
Value
    
Accumulated
Amortization
    
Carrying
Value
    
Gross
Value
    
Accumulated
Amortization
    
Carrying
Value
  
NGL Pipelines & Services:
                                    
Customer relationship intangibles
  
$
449
    
$
(257
)
  
$
192
    
$
449
    
$
(249
)
  
$
200
  
Contract-based intangibles
    
751
      
(95
)
    
656
      
749
      
(84
)
    
665
  
Segment total
    
1,200
      
(352
)
    
848
      
1,198
      
(333
)
    
865
  
Crude Oil Pipelines & Services:
                                                
Customer relationship intangibles
    
2,195
      
(477
)
    
1,718
      
2,195
      
(431
)
    
1,764
  
Contract-based intangibles
    
283
      
(273
)
    
10
      
283
      
(271
)
    
12
  
Segment total
    
2,478
      
(750
)
    
1,728
      
2,478
      
(702
)
    
1,776
  
Natural Gas Pipelines & Services:
                                                
Customer relationship intangibles
    
1,350
      
(607
)
    
743
      
1,350
      
(588
)
    
762
  
Contract-based intangibles
    
639
      
(201
)
    
438
      
639
      
(195
)
    
444
  
Segment total
    
1,989
      
(808
)
    
1,181
      
1,989
      
(783
)
    
1,206
  
Petrochemical & Refined Products Services:
                                                
Customer relationship intangibles
    
181
      
(83
)
    
98
      
181
      
(80
)
    
101
  
Contract-based intangibles
    
45
      
(29
)
    
16
      
45
      
(28
)
    
17
  
Segment total
    
226
      
(112
)
    
114
      
226
      
(108
)
    
118
  
Total intangible assets
  
$
5,893
    
$
(2,022
)
  
$
3,871
    
$
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 June 30,
    
For the Six Months
Ended June 30,
  
 
  
2023
    
2022
    
2023
    
2022
  
NGL Pipelines & Services
  
$
10
    
$
9
    
$
19
    
$
17
  
Crude Oil Pipelines & Services
    
25
      
21
      
48
      
41
  
Natural Gas Pipelines & Services
    
13
      
14
      
25
      
25
  
Petrochemical & Refined Products Services
    
2
      
1
      
4
      
3
  
Total
  
$
50
    
$
45
    
$
96
    
$
86
  
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
  
$
107
    
$
222
    
$
230
    
$
237
    
$
235