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Intangible Assets and Goodwill Goodwill Rollforward (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Line Items] |  |  |  |
Balance at January 1 | $ 1,944 |  | $ 1,502 |
Acquisitions | 657 | [1] | 274 | [2]
Foreign currency translation and other | (77) |  | 168 |
Balance at December 31 | 2,524 |  | 1,944 |
Signal and Power Solutions |  |  |  |
Goodwill [Line Items] |  |  |  |
Balance at January 1 | 1,594 |  | 1,424 |
Acquisitions | 657 | [1] | 0 | [2]
Foreign currency translation and other | (71) |  | 170 |
Balance at December 31 | 2,180 |  | 1,594 |
Advanced Safety and User Experience |  |  |  |
Goodwill [Line Items] |  |  |  |
Balance at January 1 | 350 |  | 78 |
Acquisitions | 0 | [1] | 274 | [2]
Foreign currency translation and other | (6) |  | (2) |
Balance at December 31 | $ 344 |  | $ 350 |
[1] | Primarily attributable to the acquisitions of KUM and Winchester Interconnect, as further described in Note 20. Acquisitions and Divestitures.
[2] | Primarily attributable to the acquisitions of Movimento Group and nuTonomy, Inc., as further described in Note 20. Acquisitions and Divestitures.

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