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Other Long-Term Assets, Net (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019December 31, 2018
Estimated Useful
Lives (Years)		CostAccumulated
Amortization		NetCostAccumulated
Amortization		Net
Customer contracts and relationships
1 – 20
$1,134  $(463) $671  $1,152  $(413) $739  
Property tax abatement
7 – 13
23  (18) 5  23  (16) 7  
Other agreements
25 – 70
42  (11) 31  34  (8) 26  
Intangible assets (1)
1,199  (492) 707  1,209  (437) 772  
Other152  (1) 151  144  —  144  
Other long-term assets, net$1,351  $(493) $858  $1,353  $(437) $916  

(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.
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):
2020$77  
2021$73  
2022$74  
2023$69  
2024$67