Acquisitions 1 (Details) - USD ($) $ in Millions			15 Months Ended
		Jul. 08, 2015	Jun. 30, 2016	Sep. 30, 2016	Mar. 31, 2016
Acquisition purchase price allocation
Goodwill				$ 6,083	$ 6,086
Rally
Business Acquisition
Cash acquired from Rally		$ 13
Short-term investments acquired from Rally		48
Acquisition purchase price allocation
Finite-lived intangible assets	[1]		$ 78
Goodwill			257
Deferred tax liabilities, net			(45)
Other assets net of other liabilities assumed	[2]		51
Purchase price		$ 519	519
Rally | Purchased Software
Acquisition purchase price allocation
Finite-lived intangible assets			178
Other Fiscal Year 2016 Acquisitions
Acquisition purchase price allocation
Finite-lived intangible assets	[1]		14
Goodwill			59
Deferred tax liabilities, net			(24)
Other assets net of other liabilities assumed			2
Purchase price			147
Other Fiscal Year 2016 Acquisitions | Purchased Software
Acquisition purchase price allocation
Finite-lived intangible assets			$ 96
Fiscal Year 2016 Acquisitions
Estimated useful life
Goodwill, Estimated useful life			Indefinite
Fiscal Year 2016 Acquisitions | Minimum
Estimated useful life
Finite-lived intangible assets, Estimated useful life (in years)	[1]		1 year
Fiscal Year 2016 Acquisitions | Maximum
Estimated useful life
Finite-lived intangible assets, Estimated useful life (in years)	[1]		15 years
Fiscal Year 2016 Acquisitions | Purchased Software | Minimum
Estimated useful life
Finite-lived intangible assets, Estimated useful life (in years)			5 years
Fiscal Year 2016 Acquisitions | Purchased Software | Maximum
Estimated useful life
Finite-lived intangible assets, Estimated useful life (in years)			7 years

[1] Includes customer relationships and trade names.

[2] Includes approximately $13 million of cash acquired and approximately $48 million of short-term investments acquired relating to Rally.