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Goodwill, Customer Relationships and Other Intangible Assets (Tables)
3 Months Ended
Mar. 31, 2020
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, 2020
 
December 31, 2019
 
(Dollars in millions)
Goodwill
$
9,360

 
9,360

Customer relationships, less accumulated amortization of $5,330 and $5,231
$
369

 
468

Other intangible assets, less accumulated amortization of $1,802 and $1,780
$
313

 
311


Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
We estimate that total amortization expense for intangible assets for the years ending December 31, 2020 through 2024 will be as follows:
 
(Dollars in millions)
2020 (remaining nine months)
$
359

2021
154

2022
52

2023
42

2024
33