Goodwill, Customer Relationships and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of goodwill, customer relationships and other intangible assets

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

	As of December 31,
	2021		2020
	(Dollars in millions)
Goodwill	$	9,360	9,360
Customer relationships, less accumulated amortization of $5,699 and $5,611	$	—	88
Other intangible assets, less accumulated amortization of $1,876 and $1,831	199		255
Total other intangible assets, net	$	199	343

Schedule of estimated amortization expense for intangible assets

We estimate that total amortization expense for intangible assets for the years ending December 31, 2022 through 2026 will be as follows:

	(Dollars in millions)
Year ending December 31,
2022	$	86
2023	62
2024	13
2025	12
2026	5