Goodwill, Customer Relationships and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

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:

	December 31,
	2019	2018
	(Dollars in millions)
Goodwill	7,415	11,119
Customer relationships, less accumulated amortization of $1,538 and $833	6,865	7,567
Other intangible assets subject to amortization:
Trade names, less accumulated amortization of $57 and $30	74	100
Capitalized software, less accumulated amortization of $146 and $67	395	310
Total other intangible assets, net	469	410

Schedule of goodwill

The following table shows the rollforward of goodwill from December 31, 2017 through December 31, 2019:

	(Dollars in millions)
As of December 31, 2017	$	10,837
Purchase accounting and other adjustments	340
Effect of foreign currency rate change	(58		)
As of December 31, 2018	$	11,119
Impairment	(3,708		)
Effect of foreign currency rate change and other	4
As of December 31, 2019	$	7,415

Schedule of estimated amortization expense of intangible asset

We estimate that total amortization expense for intangible assets for the successor years ending 2020 through 2024 will be as follows:

	(Dollars in millions)
2020	$	833
2021	833
2022	773
2023	744
2024	732