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Intangible Assets and Goodwill | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets Disclosure | INTANGIBLE ASSETS AND GOODWILL The changes in the carrying amount of intangible assets and goodwill were as follows as of December 31, 2018 and 2017. See Note 20. Acquisitions and Divestitures for a further description of the goodwill and intangible assets resulting from Aptiv’s acquisitions in 2018 and 2017.
|  |  | As of December 31, 2018 |  | As of December 31, 2017
| Estimated Useful Lives |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
| (Years) |  | (in millions) |  | (in millions)
Amortized intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Patents and developed technology | 3-15 |  | $ | 647 |  |  | $ | 371 |  |  | $ | 276 |  |  | $ | 639 |  |  | $ | 324 |  |  | $ | 315 |
Customer relationships | 5-14 |  | 1,046 |  |  | 261 |  |  | 785 |  |  | 798 |  |  | 219 |  |  | 579 |
Trade names | 5-20 |  | 66 |  |  | 35 |  |  | 31 |  |  | 68 |  |  | 25 |  |  | 43 |
Total |  |  | 1,759 |  |  | 667 |  |  | 1,092 |  |  | 1,505 |  |  | 568 |  |  | 937 |
Unamortized intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |
In-process research and development | — |  | 126 |  |  | — |  |  | 126 |  |  | 147 |  |  | — |  |  | 147 |
Trade names | — |  | 162 |  |  | — |  |  | 162 |  |  | 135 |  |  | — |  |  | 135 |
Goodwill | — |  | 2,524 |  |  | — |  |  | 2,524 |  |  | 1,944 |  |  | — |  |  | 1,944 |
Total |  |  | $ | 4,571 |  |  | $ | 667 |  |  | $ | 3,904 |  |  | $ | 3,731 |  |  | $ | 568 |  |  | $ | 3,163 |
Estimated amortization expense for the years ending December 31, 2019 through 2023 is presented below:
| Year Ending December 31,
| 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023
| (in millions)
Estimated amortization expense | $ | 146 |  |  | $ | 142 |  |  | $ | 140 |  |  | $ | 133 |  |  | $ | 109 |
A roll-forward of the gross carrying amounts of intangible assets for the years ended December 31, 2018 and 2017 is presented below.
| 2018 |  | 2017
| (in millions)
Balance at January 1 | $ | 3,731 |  |  | $ | 3,050 |
Acquisitions (1) | 1,000 |  |  | 398 |
Impairment (2) | (20 | ) |  | — |
Foreign currency translation and other | (140 | ) |  | 283 |
Balance at December 31 | $ | 4,571 |  |  | $ | 3,731 |
(1) | Primarily attributable to the 2018 acquisitions of KUM and Winchester Interconnect, and the 2017 acquisitions of Movimento Group and nuTonomy, Inc., as further described in Note 20. Acquisitions and Divestitures.
(2) | Primarily attributable to the impairment of certain indefinite-lived in-process research and development assets within the Advanced Safety and User Experience segment, which is included within amortization in the consolidated statement of operations. The fair value of the impaired assets was determined primarily using the anticipated cash flows discounted at a rate commensurate with the risk involved and a review of other market indicators and management estimates.
A roll-forward of the accumulated amortization for the years ended December 31, 2018 and 2017 is presented below:
| 2018 |  | 2017
| (in millions)
Balance at January 1 | $ | 568 |  |  | $ | 400 |
Amortization | 124 |  |  | 117 |
Impairment (1) | 10 |  |  | — |
Foreign currency translation and other | (35 | ) |  | 51 |
Balance at December 31 | $ | 667 |  |  | $ | 568 |
(1) | Primarily attributable to the impairment of certain definite-lived trade name assets within the Advanced Safety and User Experience segment, which is included within amortization in the consolidated statement of operations. The fair value of the impaired assets was determined primarily using the anticipated cash flows discounted at a rate commensurate with the risk involved and a review of other market indicators and management estimates.
A roll-forward of the carrying amount of goodwill, by operating segment, for the years ended December 31, 2018 and 2017 is presented below:
| Signal and Power Solutions |  | Advanced Safety and User Experience |  | Total
| (in millions)
Balance at January 1, 2017 | $ | 1,424 |  |  | $ | 78 |  |  | $ | 1,502 |
Acquisitions (1) | — |  |  | 274 |  |  | 274 |
Foreign currency translation and other | 170 |  |  | (2 | ) |  | 168 |
Balance at December 31, 2017 | $ | 1,594 |  |  | $ | 350 |  |  | $ | 1,944 |
Acquisitions (2) | $ | 657 |  |  | $ | — |  |  | $ | 657 |
Foreign currency translation and other | (71 | ) |  | (6 | ) |  | (77 | )
Balance at December 31, 2018 | $ | 2,180 |  |  | $ | 344 |  |  | $ | 2,524 |
(1) | Primarily attributable to the acquisitions of Movimento Group and nuTonomy, Inc., as further described in Note 20. Acquisitions and Divestitures.
(2) | Primarily attributable to the acquisitions of KUM and Winchester Interconnect, as further described in Note 20. Acquisitions and Divestitures.

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