v3.10.0.1

Goodwill and Intangible Assets | 9 Months Ended
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Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | Goodwill and Intangible Assets Goodwill The following table presents goodwill activities during the nine months ended September 30, 2018 (in millions):
| December 31, 2017 |  | Goodwill Acquired |  | Adjustments |  | September 30, 2018
Goodwill | $ | 4,773 |  |  | $ | 532 |  |  | $ | (135 | ) |  | $ | 5,170 |
The adjustments to goodwill during the nine months ended September 30, 2018 were primarily due to foreign currency translation. Intangible Assets The components of identifiable intangible assets as of September 30, 2018 and December 31, 2017 are as follows (in millions, except years):
| September 30, 2018 |  | December 31, 2017
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Weighted Average Useful Life (Years) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Weighted Average Useful Life (Years)
Intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer lists and user base | $ | 522 |  |  | $ | (441 | ) |  | $ | 81 |  |  | 5 |  | $ | 458 |  |  | $ | (430 | ) |  | $ | 28 |  |  | 5
Marketing related | 588 |  |  | (579 | ) |  | 9 |  |  | 5 |  | 607 |  |  | (587 | ) |  | 20 |  |  | 5
Developed technologies | 279 |  |  | (268 | ) |  | 11 |  |  | 3 |  | 273 |  |  | (258 | ) |  | 15 |  |  | 3
All other | 160 |  |  | (155 | ) |  | 5 |  |  | 4 |  | 156 |  |  | (150 | ) |  | 6 |  |  | 4
Total | $ | 1,549 |  |  | $ | (1,443 | ) |  | $ | 106 |  |  |  |  | $ | 1,494 |  |  | $ | (1,425 | ) |  | $ | 69 |  |  |
Amortization expense for intangible assets was $15 million and $16 million for the three months ended September 30, 2018 and 2017, respectively. Amortization expense for intangible assets was $49 million and $48 million for the nine months ended September 30, 2018 and 2017, respectively. Expected future intangible asset amortization as of September 30, 2018 is as follows (in millions):
Fiscal year: |  |
Remaining 2018 |  | $ | 14 |
2019 |  | 49 |
2020 |  | 34 |
2021 |  | 9 |
Total |  | $ | 106 |

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- References No definition available. + Details
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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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