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Intangible Asset, Net (Tables)
 12 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Components of intangible assets, net of accumulated amortization
Intangible assets, net of accumulated amortization, consisted of the following (in millions):

December 31, 2021December 31, 2020
Estimated Useful
Lives (Years)		CostAccumulated
Amortization		NetCostAccumulated
Amortization		Net
Customer contracts and relationships (1)
3 – 31
$2,445 $(510)$1,935 $1,291 $(519)$772 
Other agreements
1 – 70
36 (11)25 63 (30)33 
Intangible assets (2)
$2,481 $(521)$1,960 $1,354 $(549)$805 
(1)The increase in intangible assets related to Customer contracts and relationships in 2021 is associated with the assets acquired in the formation of the Permian JV. 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):
2022$240 
2023$232 
2024$220 
2025$207 
2026$187