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Intangible Assets and Goodwill | 12 Months Ended
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Dec. 31, 2015
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, 2015 and 2014. See Note 20. Acquisitions and Divestitures for a further description of the goodwill and intangible assets resulting from Delphi's acquisitions in 2015 and 2014.
|  |  | As of December 31, 2015 |  | As of December 31, 2014
| 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 | 6-15 |  | $ | 745 |  |  | $ | 279 |  |  | $ | 466 |  |  | $ | 633 |  |  | $ | 229 |  |  | $ | 404 |
Customer relationships | 4-14 |  | 861 |  |  | 171 |  |  | 690 |  |  | 394 |  |  | 143 |  |  | 251 |
Trade names | 5-20 |  | 105 |  |  | 30 |  |  | 75 |  |  | 99 |  |  | 26 |  |  | 73 |
Total |  |  | 1,711 |  |  | 480 |  |  | 1,231 |  |  | 1,126 |  |  | 398 |  |  | 728 |
Unamortized intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |
In-process research and development | — |  | 24 |  |  | — |  |  | 24 |  |  | — |  |  | — |  |  | — |
Trade names | — |  | 128 |  |  | — |  |  | 128 |  |  | — |  |  | — |  |  | — |
Goodwill | — |  | 1,539 |  |  | — |  |  | 1,539 |  |  | 656 |  |  | — |  |  | 656 |
Total |  |  | $ | 3,402 |  |  | $ | 480 |  |  | $ | 2,922 |  |  | $ | 1,782 |  |  | $ | 398 |  |  | $ | 1,384 |
Estimated amortization expense for the years ending December 31, 2016, 2017, 2018, 2019 and 2020 is presented below:
| Year Ending December 31,
| 2016 |  | 2017 |  | 2018 |  | 2019 |  | 2020
| (in millions)
Estimated amortization expense | $ | 136 |  |  | $ | 134 |  |  | $ | 129 |  |  | $ | 117 |  |  | $ | 116 |
A roll-forward of the gross carrying amounts of intangible assets for the years ended December 31, 2015 and 2014 is presented below.
| 2015 |  | 2014
| (in millions)
Balance at January 1 | $ | 1,782 |  |  | $ | 1,516 |
Acquisitions (1) | 1,701 |  |  | 384 |
Foreign currency translation and other | (81 | ) |  | (118 | )
Balance at December 31 | $ | 3,402 |  |  | $ | 1,782 |
(1) | Primarily attributable to the 2014 acquisitions of Antaya Technologies Corporation and Unwired Holdings, Inc. and the 2015 acquisitions of HellermannTyton Group PLC, Control-Tec LLC and Ottomatika, Inc., as further described in Note 20. Acquisitions and Divestitures.
A roll-forward of the accumulated amortization for the years ended December 31, 2015 and 2014 is presented below:
| 2015 |  | 2014
| (in millions)
Balance at January 1 | $ | 398 |  |  | $ | 322 |
Amortization | 93 |  |  | 94 |
Foreign currency translation and other | (11 | ) |  | (18 | )
Balance at December 31 | $ | 480 |  |  | $ | 398 |
A roll-forward of the carrying amount of goodwill, by operating segment, for the years ended December 31, 2015 and 2014 is presented below:
| Electrical/Electronic Architecture |  | Powertrain Systems |  | Electronics and Safety |  | Total
| (in millions)
Balance at January 1, 2014 | $ | 487 |  |  | $ | 9 |  |  | $ | — |  |  | $ | 496 |
Acquisitions (1) | 223 |  |  | — |  |  | — |  |  | 223 |
Foreign currency translation and other | (62 | ) |  | (1 | ) |  | — |  |  | (63 | )
Balance at December 31, 2014 | $ | 648 |  |  | $ | 8 |  |  | $ | — |  |  | $ | 656 |
Acquisitions (2) | $ | 856 |  |  | $ | — |  |  | $ | 73 |  |  | $ | 929 |
Foreign currency translation and other | (46 | ) |  | — |  |  | — |  |  | (46 | )
Balance at December 31, 2015 | $ | 1,458 |  |  | $ | 8 |  |  | $ | 73 |  |  | $ | 1,539 |
(1) | Primarily attributable to the acquisitions of Antaya Technologies Corporation and Unwired Holdings, Inc., as further described in Note 20. Acquisitions and Divestitures.
(2) | Primarily attributable to the acquisitions of HellermannTyton Group PLC, Control-Tec LLC and Ottomatika, Inc., as further described in Note 20. Acquisitions and Divestitures.

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- Definition The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 Reference 4: 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 5: 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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