Goodwill, Customer Relationships and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

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:

	Successor
	December 31, 2018		December 31, 2017
	(Dollars in millions)
Goodwill	$	11,119	10,837
Customer relationships, less accumulated amortization of $833 and $126	$	7,567	8,845
Other intangible assets subject to amortization:
Trade names, less accumulated amortization of $30 and $4	$	100	126
Developed technology, less accumulated amortization of $67 and $9	310		252
Total other intangible assets, net	$	410	378

Schedule of goodwill

The following table shows the rollforward of goodwill from November 1, 2017 through December 31, 2018:

	(Dollars in millions)
As of November 1, 2017	$	10,821
Purchase accounting and other adjustments	16
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

Schedule of estimated amortization expense of intangible asset

We estimate that total amortization expense for intangible assets for the successor years ending 2019 through 2023 will be as follows:

	(Dollars in millions)
2019	$	800
2020	800
2021	800
2022	796
2023	766