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Goodwill and Other Intangibles, net (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Amortized Intangible Assets | The balances and changes in Other Intangibles, net are as follows (in millions):
| December 31, 2017
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Amortized intangible assets |  |  |  |  |
Current technology | $ | 24 |  |  | $ | (23 | ) |  | $ | 1 |
Trade names | 41 |  |  | (41 | ) |  | — |
Unpatented technology | 242 |  |  | (205 | ) |  | 37 |
Patents and patent rights | 235 |  |  | (215 | ) |  | 20 |
Customer relationships | 481 |  |  | (240 | ) |  | 241 |
Total | $ | 1,023 |  |  | $ | (724 | ) |  | $ | 299 |
Amortization expense for the year ended December 31, 2017 |  | $ | 184 |  |  |
| December 31, 2016
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Amortized intangible assets |  |  |  |  |
Current technology | $ | 24 |  |  | $ | (21 | ) |  | $ | 3 |
Trade names | 40 |  |  | (40 | ) |  | — |
Unpatented technology | 241 |  |  | (146 | ) |  | 95 |
Patent and patent rights | 238 |  |  | (161 | ) |  | 77 |
Customer relationships | 478 |  |  | (173 | ) |  | 305 |
Total | $ | 1,021 |  |  | $ | (541 | ) |  | $ | 480 |
Amortization expense for the year ended December 31, 2016 |  | $ | 229 |  |  |
Schedule of Future Amortization Expense |
Estimated amortization expense for future periods is as follows (in millions): | Amount
For the year ended December 31, 2018 | $ | 96 |
For the year ended December 31, 2019 | 83 |
For the year ended December 31, 2020 | 39 |
For the year ended December 31, 2021 | 37 |
For the year ended December 31, 2022 | 31 |
Thereafter | 13 |
Total | $ | 299 |
Changes in Net Carrying Value of Goodwill | Changes in the net carrying value amount of goodwill were as follows (in millions):
| Total
Goodwill as of December 31, 2015 | $ | 2,490 |
Impairment charge – wireless LAN divestiture | (32 | )
Goodwill as of December 31, 2016 | 2,458 |
Foreign exchange impact | 7 |
Goodwill as of December 31, 2017 | $ | 2,465 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + 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=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + 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=66006027&loc=d3e16323-109275 + Details
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