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Intangible Assets
 12 Months Ended
Dec. 31, 2019
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]  
Intangible Assets Intangible Assets

Intangible assets as of December 31, 2019 consist of the following (in millions):
 
Cost
 
Accumulated
Amortization
 
Net
Customer relationships and other
$
18,018

 
$
(2,681
)
 
$
15,337

Finite-lived trademarks
503

 
(85
)
 
418

Indefinite-lived trademarks
43

 
—

 
43

Total Intangible assets, net
$
18,564

 
$
(2,766
)
 
$
15,798


Intangible assets as of December 31, 2018 consist of the following (in millions):
 
Cost
 
Accumulated
Amortization
 
Net
Customer relationships and other
$
6,011

 
$
(2,944
)
 
$
3,067

Finite-lived trademarks
68

 
(46
)
 
22

Indefinite-lived trademarks
43

 
—

 
43

Total Intangible assets, net
$
6,122

 
$
(2,990
)
 
$
3,132



Amortization expense for intangible assets with finite lives, including the contract intangible in our Brazilian Venture, which was amortized as a reduction of revenue until impaired during the third quarter of 2018 (see Note 19), was $1,444 million, $659 million and $670 million for the years ended December 31, 2019, 2018 and 2017, respectively.

Estimated amortization of intangible assets for the next five years is as follows (in millions):
2020
$
2,382

2021
2,308

2022
2,155

2023
1,967

2024
1,773