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Goodwill, Customer Relationships and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2015
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,
| 2015 |  | 2014
| (Dollars in millions)
Goodwill | $ | 9,354 |  |  | 9,354 |
Customer relationships, less accumulated amortization of $3,264 and $2,660 | 2,435 |  |  | 3,039 |
Other intangible assets subject to amortization: |  |  |
Capitalized software, less accumulated amortization of $1,383 and $1,247 | 613 |  |  | 808 |
Summary of amortization expense | Total amortization expense for intangible assets was as follows:
| Years Ended December 31,
| 2015 |  | 2014 |  | 2013
| (Dollars in millions)
Amortization expense for intangible assets | $ | 871 |  |  | 957 |  |  | 1,029 |
Schedule of estimated amortization expense for intangible assets | We estimate that total amortization expense for intangible assets for the years ending December 31, 2016 through 2020 will be as follows:
| (Dollars in millions)
Year ending December 31, |
2016 | $ | 725 |
2017 | 661 |
2018 | 587 |
2019 | 507 |
2020 | 435 |

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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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