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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of goodwill, customer relationships and other intangible assets
Goodwill and other intangible assets consisted of the following:

As of December 31,
20242023
(Dollars in millions)
Goodwill, less accumulated impairment losses of $2,405 and $2,405
$6,955 6,955 
Other intangible assets, less accumulated amortization of $1,841 and $1,966
$84 103 
Schedule of goodwill
The following table shows the rollforward of goodwill from December 31, 2022 through December 31, 2024:

(Dollars in millions)
As of December 31, 2022
$9,360 
Impairment(2,405)
As of December 31, 2023(1)
6,955 
As of December 31, 2024(1)
$6,955 
______________________________________________________________________
(1)Goodwill at December 31, 2024 and December 31, 2023 is net of accumulated impairment losses of $2.4 billion.
Schedule of estimated amortization expense for intangible assets
We estimate that future total amortization expense for finite-lived intangible assets will be as follows:

(Dollars in millions)
2025$27 
202617 
202713 
202810 
20296 
2030 and thereafter
11 
Total finite-lived intangible assets future amortization expense
$84