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Goodwill and Acquisition-Related Intangibles - Components of Acquisition Related Intangible Assets (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Acquired Finite Lived Intangible Assets [Line Items] |  |
Acquisition-related intangibles, gross carrying amount | $ 2,940 | $ 2,940
Acquisition-related intangibles, accumulated amortization | 2,233 | 1,994
Acquisition-related intangibles, net | 707 | 946
Developed technology |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Acquisition-related intangibles, gross carrying amount | 2,130 | 2,130
Acquisition-related intangibles, accumulated amortization | 1,524 | 1,361
Acquisition-related intangibles, net | $ 606 | 769
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 | $ 810 | 810
Acquisition-related intangibles, accumulated amortization | 709 | 633
Acquisition-related intangibles, net | $ 101 | $ 177

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