Goodwill, Customer Relationships and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2014

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,
	2014		2013
	(Dollars in millions)
Goodwill	$	9,354	9,354
Customer relationships, less accumulated amortization of $2,660 and $2,012	3,039		3,687
Other intangible assets subject to amortization:
Capitalized software, less accumulated amortization of $1,247 and $994	808		1,008

Summary of amortization expense

Total amortization expense for intangible assets was as follows:

	Years Ended December 31,
	2014		2013	2012
	(Dollars in millions)
Amortization expense for intangible assets	$	957	1,029	1,115

Schedule of estimated amortization expense for intangible assets

We estimate that total amortization expense for intangible assets for the years ending December 31, 2015 through 2019 will be as follows:

	(Dollars in millions)
Year ending December 31,
2015	$	808
2016	740
2017	669
2018	589
2019	503