Intangibles

12 Months Ended

Dec. 31, 2024

(7) Intangibles:

We consider whether the carrying values of finite-lived intangible assets and property plant and equipment may not be recoverable or whether the carrying value of certain indefinite-lived intangible assets were impaired. No impairment was present for either intangibles or property plant and equipment as of December 31, 2024, 2023, and 2022.

The balances of these assets are as follows:


	December 31, 2024						December 31, 2023
	Gross Carrying		Accumulated		Net Carrying		Gross Carrying		Accumulated		Net Carrying
($ in millions)	Amount		Amortization		Amount		Amount		Amortization		Amount

Intangibles:
Customer Relationships - Business	$	800	$	(267)	$	533	$	800	$	(194)	$	606
Customer Relationships - Wholesale		3,491		(800)		2,691		3,491		(582)		2,909
Trademarks & Tradenames		150		(110)		40		150		(80)		70
Total other intangibles	$	4,441	$	(1,177)	$	3,264	$	4,441	$	(856)	$	3,585

Amortization expense was as follows:


	For the year ended		For the year ended		For the year ended
	December 31,		December 31,		December 31,
($ in millions)	2023		2022		2021

Amortization expense	$	321	$	321	$	321

We amortize our intangible assets on a straight line basis, over the assigned useful lives of 16 years for our wholesale customer relationships, 11 years for our business customer relationships, and five years for our trademarks and tradenames. Amortization expense based on our current estimate of useful lives, is estimated to be approximately $321 million in 2025, $301 million in 2026, and $291 million in 2027, 2028 and 2029.