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Goodwill, Customer Relationships and Other Intangible Assets
12 Months Ended
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill, Customer Relationships and Other Intangible Assets
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


As of December 31, 2014, the gross carrying amount of goodwill, customer relationships and other intangible assets was $17.108 billion.
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


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


We annually review the estimated lives and methods used to amortize our other intangible assets. The actual amounts of amortization expense may differ materially from our estimates, depending on the results of our annual reviews.
Our goodwill impairment assessment is done at the reporting unit level; in reviewing the criteria for reporting units when assigning the goodwill resulting from our acquisition by CenturyLink, we have determined that we are one reporting unit. We are required to assess goodwill recorded in business combinations for impairment at least annually, or more frequently such as when events or circumstances indicate there may be impairment. Our annual goodwill impairment assessment date is October 31. We are required to write-down the value of goodwill when our assessment determines the recorded amount of goodwill exceeds the fair value.
We compare our estimated fair value of equity to our carrying value of equity. If the estimated fair value of our equity is greater than the carrying value of our equity, we conclude that no impairment exists. If the estimated fair value of our equity is less than our carrying value of our equity, a second calculation is required in which the implied fair value of goodwill is compared to our carrying value of goodwill. If the implied fair value of goodwill is less than our carrying value of goodwill, goodwill must be written down to the implied fair value.
At October 31, 2014, we estimated the fair value of our equity by considering both a market approach method and a discounted cash flow method, which resulted in a Level 3 fair value measurement. The market approach method includes the use of comparable multiples of publicly traded companies whose services are comparable to ours. The discounted cash flow method is based on the present value of projected cash flows and a terminal value, which represents the expected normalized cash flows beyond the cash flows from the discrete projection period. We discounted the estimated cash flows using a rate that represents our estimated weighted average cost of capital, which we determined to be approximately 6.0% as of the assessment date (which was comprised of an after-tax cost of debt of 2.9% and a cost of equity of 8.2%). Based on our assessment performed with respect to our reporting unit described above, we concluded that our goodwill was not impaired.