Goodwill, Customer Relationships and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

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		Predecessor
	December 31, 2017		December 31, 2016
	(Dollars in millions)
Goodwill	$	10,837	7,729
Customer relationships, less accumulated amortization of $126 and $1,113	8,845		860
Other indefinite-life intangible assets	—		15
Other intangible assets subject to amortization:
Trade names, less accumulated amortization of $4 and $0	126		—
Developed technology, less accumulated amortization of $9 and $189	252		40
Total other intangible assets, net	$	378	55

Schedule of estimated amortization expense of intangible asset

We estimate that total amortization expense for intangible assets for the successor years ending December 31, 2018 through 2022 will be as follows:

	(Dollars in millions)
2018	$	829
2019	829
2020	829
2021	829
2022	816