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Intangible Assets and Goodwill (Tables)
 6 Months Ended
Jun. 30, 2024
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, 2024
    
December 31, 2023
  
 
  
Gross
Value
    
Accumulated
Amortization
    
Carrying
Value
    
Gross
Value
    
Accumulated
Amortization
    
Carrying
Value
  
NGL Pipelines & Services:
                                    
Customer relationship intangibles
  
$
449
    
$
(269
)
  
$
180
    
$
449
    
$
(263
)
  
$
186
  
Contract-based intangibles
    
753
      
(125
)
    
628
      
752
      
(110
)
    
642
  
Segment total
    
1,202
      
(394
)
    
808
      
1,201
      
(373
)
    
828
  
Crude Oil Pipelines & Services:
                                                
Customer relationship intangibles
    
2,195
      
(579
)
    
1,616
      
2,195
      
(530
)
    
1,665
  
Contract-based intangibles
    
283
      
(277
)
    
6
      
283
      
(275
)
    
8
  
Segment total
    
2,478
      
(856
)
    
1,622
      
2,478
      
(805
)
    
1,673
  
Natural Gas Pipelines & Services:
                                                
Customer relationship intangibles
    
1,351
      
(644
)
    
707
      
1,351
      
(625
)
    
726
  
Contract-based intangibles
    
642
      
(216
)
    
426
      
641
      
(209
)
    
432
  
Segment total
    
1,993
      
(860
)
    
1,133
      
1,992
      
(834
)
    
1,158
  
Petrochemical & Refined Products Services:
                                                
Customer relationship intangibles
    
181
      
(88
)
    
93
      
181
      
(86
)
    
95
  
Contract-based intangibles
    
45
      
(30
)
    
15
      
45
      
(29
)
    
16
  
Segment total
    
226
      
(118
)
    
108
      
226
      
(115
)
    
111
  
Total intangible assets
  
$
5,899
    
$
(2,228
)
  
$
3,671
    
$
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 June 30,
    
For the Six Months
Ended June 30,
  
 
  
2024
    
2023
    
2024
    
2023
  
NGL Pipelines & Services
  
$
11
    
$
10
    
$
21
    
$
19
  
Crude Oil Pipelines & Services
    
26
      
25
      
51
      
48
  
Natural Gas Pipelines & Services
    
13
      
13
      
26
      
25
  
Petrochemical & Refined Products Services
    
1
      
2
      
3
      
4
  
Total
  
$
51
    
$
50
    
$
101
    
$
96
  
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
  
$
107
    
$
209
    
$
203
    
$
185
    
$
181