Goodwill, Customer Relationships and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2022

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,
	2022		2021
	(Dollars in millions)
Goodwill	$	9,360	9,360
Customer relationships, less accumulated amortization of $— and $5,699 (1)	$	—	—
Other intangible assets, less accumulated amortization of $1,924 and $1,876	138		199
Total other intangible assets, net	$	138	199

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(1)Customer relationships with a gross carrying value of $5.7 billion became fully amortized during 2021 and were retired during the first quarter of 2022.

Schedule of estimated amortization expense for intangible assets

We estimate that total amortization expense for intangible assets for the years ending December 31, 2023 through 2027 will be as follows:

	(Dollars in millions)
Year ending December 31,
2023	$	61
2024	33
2025	15
2026	9
2027	7