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Goodwill and acquisition-related intangibles - Components of Acquisition Related Intangible Assets (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquisition-related intangibles, gross carrying amount | $ 2,000 | $ 2,935
Acquisition-related intangibles, accumulated amortization | 1,610 | 2,307
Acquisition-related intangibles, net | 390 | 628
Developed technology |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquisition-related intangibles, gross carrying amount | 2,000 | 2,125
Acquisition-related intangibles, accumulated amortization | 1,610 | 1,573
Acquisition-related intangibles, net | $ 390 | 552
Developed technology | Minimum |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquisition-related intangibles, amortization period | 7 years |
Developed technology | Maximum |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquisition-related intangibles, amortization period | 10 years |
Customer relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquisition-related intangibles, amortization period | 8 years |
Acquisition-related intangibles, gross carrying amount | $ 0 | 810
Acquisition-related intangibles, accumulated amortization | 0 | 734
Acquisition-related intangibles, net | $ 0 | $ 76

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