The following table displays the composition of Other intangible assets, net:
| (dollars in millions) | ||||||||||||||||||||||||
| 2013 | 2012 | |||||||||||||||||||||||
| At December 31, |
Gross Amount |
Accumulated Amortization |
Net Amount |
Gross Amount |
Accumulated Amortization |
Net Amount |
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|
Customer lists (5 to 13 years) |
$ | 3,639 | $ | (2,660 | ) | $ | 979 | $ | 3,556 | $ | (2,338 | ) | $ | 1,218 | ||||||||||
|
Non-network internal-use software (3 to 7 years) |
11,770 | (7,317 | ) | 4,453 | 10,415 | (6,210 | ) | 4,205 | ||||||||||||||||
|
Other (2 to 25 years) |
691 | (323 | ) | 368 | 802 | (292 | ) | 510 | ||||||||||||||||
|
|
|
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|
Total |
$ | 16,100 | $ | (10,300 | ) | $ | 5,800 | $ | 14,773 | $ | (8,840 | ) | $ | 5,933 | ||||||||||
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