Intangible Assets

9 Months Ended

Sep. 30, 2024

Intangible Assets

Intangible Assets

(5) Intangible Assets

Intangible Assets Subject to Amortization, net

	September 30, 2024				December 31, 2023
	Gross			Net	Gross		Net
	carrying		Accumulated	carrying	carrying	Accumulated	carrying
	amount		amortization	amount	amount	amortization	amount
	amounts in millions
Customer relationships	$	515	(163)	352	515	(132)	383
Other amortizable intangible assets		162	(91)	71	156	(78)	78
Total	$	677	(254)	423	671	(210)	461

Amortization expense for intangible assets with finite useful lives was $15 million and $16 million for the three months ended September 30, 2024 and 2023, respectively, and $45 million and $48 million for the nine months ended September 30, 2024 and 2023, respectively. Amortization expense for amortizable intangible assets for each of the five succeeding fiscal years is estimated to be (amounts in millions):

Remainder of 2024	$	15
2025	$	55
2026	$	52
2027	$	50
2028	$	48