Goodwill, Customer Relationships and Other Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets and Goodwill

Goodwill, customer relationships and other intangible assets consisted of the following:

	March 31, 2024		December 31, 2023
	(Dollars in millions)
Goodwill	$	1,964	1,964
Indefinite-lived intangible assets	$	9	9
Other intangible assets subject to amortization:
Customer relationships, less accumulated amortization of $4,047 and $4,248	3,656		3,811
Capitalized software, less accumulated amortization of $3,981 and $4,045(1)	1,542		1,564
Trade names, patents and other, less accumulated amortization of $75 and $72(1)	83		86
Total other intangible assets, net	$	5,290	5,470

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(1)    Certain customer relationships with a gross carrying value of $352 million and capitalized software with a gross carrying value of $153 million became fully amortized during 2023 and were retired during the three months ended March 31, 2024.

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

We estimate that total amortization expense for finite-lived intangible assets for the years ending December 31, 2024 through 2028 will be as provided in the table below.

	(Dollars in millions)
2024 (remaining nine months)	$	736
2025	895
2026	841
2027	753
2028	686