Acquisitions 1 (Details) - USD ($) $ in Millions				9 Months Ended
		Mar. 31, 2017	Jan. 18, 2017	Dec. 31, 2017
Acquisition purchase price allocation
Goodwill		$ 6,857		$ 6,799
Automic
Business Acquisition
Cash acquired from acquisition			$ 34
Acquisition purchase price allocation
Finite-lived intangible assets	[1]			174
Goodwill				303
Deferred tax liabilities, net				(92)
Other assets (liabilities), net	[2]			17
Purchase price				675
Automic | Purchased Software
Acquisition purchase price allocation
Finite-lived intangible assets				273
Veracode
Business Acquisition
Cash acquired from acquisition		$ 16
Acquisition purchase price allocation
Finite-lived intangible assets	[1]			99
Goodwill				339
Deferred tax liabilities, net				(36)
Other assets (liabilities), net	[2]			(24)
Purchase price				618
Veracode | Purchased Software
Acquisition purchase price allocation
Finite-lived intangible assets				$ 240
Automic and Veracode
Estimated useful life
Goodwill, Estimated useful life				Indefinite
Automic and Veracode | Minimum
Estimated useful life
Finite-lived intangible assets, Estimated useful life (in years)	[1]			2 years
Automic and Veracode | Maximum
Estimated useful life
Finite-lived intangible assets, Estimated useful life (in years)	[1]			12 years
Automic and Veracode | Purchased Software | Minimum
Estimated useful life
Finite-lived intangible assets, Estimated useful life (in years)				1 year
Automic and Veracode | Purchased Software | Maximum
Estimated useful life
Finite-lived intangible assets, Estimated useful life (in years)				8 years

[1] Includes customer relationships and trade names.

[2] Includes approximately $34 million and $16 million of cash acquired from Automic and Veracode, respectively.