Goodwill and Intangible Assets (Schedule of Intangible Assets, Net) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,703	$ 2,698
Accumulated Amortization	(694)	(577)
Net Carrying Amount	2,009	2,121
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	3,586	3,581
Net Carrying Amount	2,892	3,004	[1]
Trade Names
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	864	864
In-process research and development
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	19	19
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,650	1,646
Accumulated Amortization	(382)	(322)
Net Carrying Amount	1,268	1,324
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,007	1,006
Accumulated Amortization	(284)	(229)
Net Carrying Amount	723	777
Trade Names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	46	46
Accumulated Amortization	(28)	(26)
Net Carrying Amount	$ 18	$ 20

[1] Derived from audited financial statements.