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Intangible Assets and Goodwill (Tables)
 9 Months Ended
Sep. 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:

   
September 30, 2023
    
December 31, 2022
  
 
  
Gross
Value
    
Accumulated
Amortization
    
Carrying
Value
    
Gross
Value
    
Accumulated
Amortization
    
Carrying
Value
  
NGL Pipelines & Services:
                                    
Customer relationship intangibles
  
$
449
    
$
(260
)
  
$
189
    
$
449
    
$
(249
)
  
$
200
  
Contract-based intangibles
    
752
      
(102
)
    
650
      
749
      
(84
)
    
665
  
Segment total
    
1,201
      
(362
)
    
839
      
1,198
      
(333
)
    
865
  
Crude Oil Pipelines & Services:
                                                
Customer relationship intangibles
    
2,195
      
(504
)
    
1,691
      
2,195
      
(431
)
    
1,764
  
Contract-based intangibles
    
283
      
(274
)
    
9
      
283
      
(271
)
    
12
  
Segment total
    
2,478
      
(778
)
    
1,700
      
2,478
      
(702
)
    
1,776
  
Natural Gas Pipelines & Services:
                                                
Customer relationship intangibles
    
1,350
      
(615
)
    
735
      
1,350
      
(588
)
    
762
  
Contract-based intangibles
    
640
      
(205
)
    
435
      
639
      
(195
)
    
444
  
Segment total
    
1,990
      
(820
)
    
1,170
      
1,989
      
(783
)
    
1,206
  
Petrochemical & Refined Products Services:
                                                
Customer relationship intangibles
    
181
      
(85
)
    
96
      
181
      
(80
)
    
101
  
Contract-based intangibles
    
45
      
(29
)
    
16
      
45
      
(28
)
    
17
  
Segment total
    
226
      
(114
)
    
112
      
226
      
(108
)
    
118
  
Total intangible assets
  
$
5,895
    
$
(2,074
)
  
$
3,821
    
$
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 September 30,
    
For the Nine Months
Ended September 30,
  
 
  
2023
    
2022
    
2023
    
2022
  
NGL Pipelines & Services
  
$
10
    
$
10
    
$
29
    
$
27
  
Crude Oil Pipelines & Services
    
28
      
21
      
76
      
62
  
Natural Gas Pipelines & Services
    
12
      
13
      
37
      
38
  
Petrochemical & Refined Products Services
    
2
      
2
      
6
      
5
  
Total
  
$
52
    
$
46
    
$
148
    
$
132
  
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
  
$
55
    
$
222
    
$
231
    
$
237
    
$
236