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Intangible Assets

12 Months Ended

Dec. 31, 2020

Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]

Intangible assets as of December 31, 2020, consist of the following (in millions):


	Cost		Accumulated Amortization		Net
Customer relationships and other	$	18,586	$	(5,024)	$	13,562
Finite-lived trademarks	511		(189)		322
Indefinite-lived trademarks	44		—		44
Total Intangible assets, net	$	19,141	$	(5,213)	$	13,928

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

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 $2,400 million, $1,444 million and $659 million for the years ended December 31, 2020, 2019 and 2018, respectively.

Estimated amortization of intangible assets for the next five years is as follows (in millions):


2021	$	2,378
2022	2,226
2023	2,035
2024	1,836
2025	1,667