Acquired Intangible Assets (Detail) - GitHub, Inc. - USD ($) $ in Millions	Oct. 25, 2018	Mar. 31, 2019
Acquired Finite Lived Intangible Assets [Line Items]
Amount	$ 1,267	$ 1,300
Weighted Average Life	7 years
Customer-related
Acquired Finite Lived Intangible Assets [Line Items]
Amount	$ 648
Weighted Average Life	8 years
Technology-based
Acquired Finite Lived Intangible Assets [Line Items]
Amount	$ 447
Weighted Average Life	5 years
Marketing-related
Acquired Finite Lived Intangible Assets [Line Items]
Amount	$ 170
Weighted Average Life	10 years
Contract-based
Acquired Finite Lived Intangible Assets [Line Items]
Amount	$ 2
Weighted Average Life	2 years