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Other Long-Term Assets, Net (Tables)
 12 Months Ended
Dec. 31, 2017
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,
 
2017
 
2016
Intangible assets (1)
$
1,265

 
$
603

Other
60

 
48

 
1,325

 
651

Accumulated amortization
(421
)
 
(361
)
 
$
904

 
$
290


 
(1) 
We include rights-of-way, which are intangible assets, in our pipeline and related facilities amounts within property and equipment. See Note 5 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, 2017
 
December 31, 2016
 
Estimated Useful
Lives (Years)
 
Cost
 
Accumulated
Amortization
 
Net
 
Cost
 
Accumulated
Amortization
 
Net
Customer contracts and relationships
1 – 20
 
$
1,188

 
$
(383
)
 
$
805

 
$
529

 
$
(330
)
 
$
199

Property tax abatement
7 – 13
 
38

 
(30
)
 
8

 
38

 
(26
)
 
12

Other agreements
25 – 70
 
39

 
(8
)
 
31

 
36

 
(5
)
 
31

 
 
 
$
1,265

 
$
(421
)
 
$
844

 
$
603

 
$
(361
)
 
$
242
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):
2018
$
63

2019
$
68

2020
$
74

2021
$
75

2022
$
76