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Other Long-Term Assets, Net (Tables)
 12 Months Ended
Dec. 31, 2020
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, 2020December 31, 2019
Estimated Useful
Lives (Years)		CostAccumulated
Amortization		NetCostAccumulated
Amortization		Net
Customer contracts and relationships (1)
3 – 29
$1,291 $(519)$772 $1,134 $(463)$671 
Property tax abatement
13
23 (20)3 23 (18)5 
Other agreements
1 – 70
40 (10)30 42 (11)31 
Intangible assets (2)
1,354 (549)805 1,199 (492)707 
Other165 (3)162 152 (1)151 
Other long-term assets, net$1,519 $(552)$967 $1,351 $(493)$858 

(1)Amounts for the year ended December 31, 2020 include intangible assets associated with the acquisition of FM Gathering. See Note 7 for additional information.
(2)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):
2021$87 
2022$86 
2023$82 
2024$80 
2025$77