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Intangible Assets

12 Months Ended

Dec. 31, 2023

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

Intangible assets as of December 31, 2023, consist of the following (in millions):


	Cost		Accumulated Amortization		Net
Customer relationships	$	6,326	$	(4,583)	$	1,743
Trademarks and other	142		(62)		80
Total Intangible assets, net	$	6,468	$	(4,645)	$	1,823

Intangible assets as of December 31, 2022, consist of the following (in millions):


	Cost		Accumulated Amortization		Net
Customer relationships	$	6,281	$	(3,953)	$	2,328
Trademarks and other	193		(53)		140
Total Intangible assets, net	$	6,474	$	(4,006)	$	2,468

Amortization expense for intangible assets with finite lives was $467 million, $486 million and $484 million for the years ended December 31, 2023, 2022 and 2021, respectively.

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


2024	$	634
2025	560
2026	192
2027	161
2028	143