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Other Long-Term Assets, Net (Tables)
12 Months Ended
Dec. 31, 2018
Other Assets [Abstract]  
Components of other long-term assets, net of accumulated amortization
Other long-term assets, net of accumulated amortization, consisted of the following (in millions):
 
December 31,
 
2018
 
2017
Intangible assets (1)
$
1,209

 
$
1,265

Other
144

 
60

 
1,353

 
1,325

Accumulated amortization
(437
)
 
(421
)
 
$
916

 
$
904


 
(1) 
We include rights-of-way, which are intangible assets, in our pipeline and related facilities amounts within property and equipment. See Note 6 for a discussion of property and equipment.
Components of intangible assets that have finite lives
Our intangible assets that have finite lives consisted of the following (in millions):
 
 
 
December 31, 2018
 
December 31, 2017
 
Estimated Useful
Lives (Years)
 
Cost
 
Accumulated
Amortization
 
Net
 
Cost
 
Accumulated
Amortization
 
Net
Customer contracts and relationships
1 – 20
 
$
1,152

 
$
(413
)
 
$
739

 
$
1,188

 
$
(383
)
 
$
805

Property tax abatement
7 – 13
 
23

 
(16
)
 
7

 
38

 
(30
)
 
8

Other agreements
25 – 70
 
34

 
(8
)
 
26

 
39

 
(8
)
 
31

 
 
 
$
1,209

 
$
(437
)
 
$
772

 
$
1,265

 
$
(421
)
 
$
844


Estimated amortization expense related to finite-lived intangible assets for the next five years
We estimate that our amortization expense related to finite-lived intangible assets for the next five years will be as follows (in millions):
2019
$
70

2020
$
75

2021
$
75

2022
$
73

2023
$
68