Other Intangibles

3 Months Ended

Mar. 31, 2021

Other Intangibles [Abstract]

Other Intangibles

(7) Other Intangibles:

The components of other intangibles are as follows:

	March 31, 2021						December 31, 2020
	Gross Carrying		Accumulated		Net Carrying		Gross Carrying		Accumulated		Net Carrying
($ in millions)	Amount		Amortization		Amount		Amount		Amortization		Amount
Other Intangibles:
Customer base	$	4,332	$	(3,856)	$	476	$	4,332	$	(3,781)	$	551
Trade name		122		-		122		122		-		122
Royalty agreement		72		(72)		-		72		(68)		4
Total other intangibles	$	4,526	$	(3,928)	$	598	$	4,526	$	(3,849)	$	677

Amortization expense was as follows:

	For the three months ended
	March 31,
($ in millions)	2021		2020
Amortization expense	$	79	$	99

Amortization expense primarily represents the amortization of our customer base acquired as a result of our acquisitions in 2010, 2014, and 2016 with each based on a useful life of 8 to 12 years and amortized on an accelerated method. Our Trade name is an indefinite-lived intangible asset that is not subject to amortization.