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Business Combinations - Additional Information (Detail) - USD ($) $ in Millions | Sep. 17, 2018 | Aug. 04, 2017 | Jun. 15, 2017 | Mar. 24, 2017
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Privately Held Software |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition cash paid | $ 3 |  |  |
Plexistor Limited |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition cash paid |  |  | $ 24 |
Plexistor Limited | Developed Technology |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition cash paid |  |  | 6 |
Plexistor Limited | Goodwill |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition cash paid |  |  | $ 17 |
Greenqloud ehf |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition cash paid |  | $ 51 |  |
Greenqloud ehf | Developed Technology |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition cash paid |  | 10 |  |
Greenqloud ehf | Goodwill |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition cash paid |  | $ 38 |  |
Privately Held Consulting and Software Development |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition cash paid |  |  |  | $ 8

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